diff --git a/hawk/bin/Makefile.am b/hawk/bin/Makefile.am
index d8419570..cfca940a 100644
--- a/hawk/bin/Makefile.am
+++ b/hawk/bin/Makefile.am
@@ -18,7 +18,7 @@ bin_PROGRAMS = hawk hsed
 ##################################################
 # hawk
 ##################################################
-hawk_SOURCES = main-hawk.c 
+hawk_SOURCES = bin-hawk.c 
 hawk_CPPFLAGS = $(CPPFLAGS_COMMON)
 hawk_CFLAGS = $(CFLAGS_COMMON)
 hawk_LDFLAGS = $(LDFLAGS_COMMON)
@@ -38,7 +38,7 @@ hawk_LDFLAGS = $(LDFLAGS_COMMON)
 ##
 hawk_LDADD = $(LIBADD_COMMON) $(LIBM)
 
-hsed_SOURCES = main-hsed.c 
+hsed_SOURCES = bin-hsed.c 
 hsed_CPPFLAGS = $(CPPFLAGS_COMMON)
 hsed_CFLAGS = $(CFLAGS_COMMON)
 hsed_LDFLAGS = $(LDFLAGS_COMMON)
diff --git a/hawk/bin/Makefile.in b/hawk/bin/Makefile.in
index f57fa5c9..7c30563c 100644
--- a/hawk/bin/Makefile.in
+++ b/hawk/bin/Makefile.in
@@ -109,7 +109,7 @@ CONFIG_CLEAN_FILES =
 CONFIG_CLEAN_VPATH_FILES =
 am__installdirs = "$(DESTDIR)$(bindir)"
 PROGRAMS = $(bin_PROGRAMS)
-am_hawk_OBJECTS = hawk-main-hawk.$(OBJEXT)
+am_hawk_OBJECTS = hawk-bin-hawk.$(OBJEXT)
 hawk_OBJECTS = $(am_hawk_OBJECTS)
 am__DEPENDENCIES_1 =
 hawk_DEPENDENCIES = $(LIBADD_COMMON) $(am__DEPENDENCIES_1)
@@ -120,7 +120,7 @@ am__v_lt_1 =
 hawk_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(hawk_CFLAGS) $(CFLAGS) \
 	$(hawk_LDFLAGS) $(LDFLAGS) -o $@
-am_hsed_OBJECTS = hsed-main-hsed.$(OBJEXT)
+am_hsed_OBJECTS = hsed-bin-hsed.$(OBJEXT)
 hsed_OBJECTS = $(am_hsed_OBJECTS)
 hsed_DEPENDENCIES = $(LIBADD_COMMON) $(am__DEPENDENCIES_1)
 hsed_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
@@ -141,8 +141,8 @@ am__v_at_1 =
 DEFAULT_INCLUDES = 
 depcomp = $(SHELL) $(top_srcdir)/ac/depcomp
 am__maybe_remake_depfiles = depfiles
-am__depfiles_remade = ./$(DEPDIR)/hawk-main-hawk.Po \
-	./$(DEPDIR)/hsed-main-hsed.Po
+am__depfiles_remade = ./$(DEPDIR)/hawk-bin-hawk.Po \
+	./$(DEPDIR)/hsed-bin-hsed.Po
 am__mv = mv -f
 COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
 	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
@@ -353,12 +353,12 @@ LIBADD_COMMON = ../lib/libhawk.la
 ##################################################
 # hawk
 ##################################################
-hawk_SOURCES = main-hawk.c 
+hawk_SOURCES = bin-hawk.c 
 hawk_CPPFLAGS = $(CPPFLAGS_COMMON)
 hawk_CFLAGS = $(CFLAGS_COMMON)
 hawk_LDFLAGS = $(LDFLAGS_COMMON)
 hawk_LDADD = $(LIBADD_COMMON) $(LIBM)
-hsed_SOURCES = main-hsed.c 
+hsed_SOURCES = bin-hsed.c 
 hsed_CPPFLAGS = $(CPPFLAGS_COMMON)
 hsed_CFLAGS = $(CFLAGS_COMMON)
 hsed_LDFLAGS = $(LDFLAGS_COMMON)
@@ -460,8 +460,8 @@ mostlyclean-compile:
 distclean-compile:
 	-rm -f *.tab.c
 
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/hawk-main-hawk.Po@am__quote@ # am--include-marker
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/hsed-main-hsed.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/hawk-bin-hawk.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/hsed-bin-hsed.Po@am__quote@ # am--include-marker
 
 $(am__depfiles_remade):
 	@$(MKDIR_P) $(@D)
@@ -493,33 +493,33 @@ am--depfiles: $(am__depfiles_remade)
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
 
-hawk-main-hawk.o: main-hawk.c
-@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hawk_CPPFLAGS) $(CPPFLAGS) $(hawk_CFLAGS) $(CFLAGS) -MT hawk-main-hawk.o -MD -MP -MF $(DEPDIR)/hawk-main-hawk.Tpo -c -o hawk-main-hawk.o `test -f 'main-hawk.c' || echo '$(srcdir)/'`main-hawk.c
-@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/hawk-main-hawk.Tpo $(DEPDIR)/hawk-main-hawk.Po
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='main-hawk.c' object='hawk-main-hawk.o' libtool=no @AMDEPBACKSLASH@
+hawk-bin-hawk.o: bin-hawk.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hawk_CPPFLAGS) $(CPPFLAGS) $(hawk_CFLAGS) $(CFLAGS) -MT hawk-bin-hawk.o -MD -MP -MF $(DEPDIR)/hawk-bin-hawk.Tpo -c -o hawk-bin-hawk.o `test -f 'bin-hawk.c' || echo '$(srcdir)/'`bin-hawk.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/hawk-bin-hawk.Tpo $(DEPDIR)/hawk-bin-hawk.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='bin-hawk.c' object='hawk-bin-hawk.o' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hawk_CPPFLAGS) $(CPPFLAGS) $(hawk_CFLAGS) $(CFLAGS) -c -o hawk-main-hawk.o `test -f 'main-hawk.c' || echo '$(srcdir)/'`main-hawk.c
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hawk_CPPFLAGS) $(CPPFLAGS) $(hawk_CFLAGS) $(CFLAGS) -c -o hawk-bin-hawk.o `test -f 'bin-hawk.c' || echo '$(srcdir)/'`bin-hawk.c
 
-hawk-main-hawk.obj: main-hawk.c
-@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hawk_CPPFLAGS) $(CPPFLAGS) $(hawk_CFLAGS) $(CFLAGS) -MT hawk-main-hawk.obj -MD -MP -MF $(DEPDIR)/hawk-main-hawk.Tpo -c -o hawk-main-hawk.obj `if test -f 'main-hawk.c'; then $(CYGPATH_W) 'main-hawk.c'; else $(CYGPATH_W) '$(srcdir)/main-hawk.c'; fi`
-@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/hawk-main-hawk.Tpo $(DEPDIR)/hawk-main-hawk.Po
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='main-hawk.c' object='hawk-main-hawk.obj' libtool=no @AMDEPBACKSLASH@
+hawk-bin-hawk.obj: bin-hawk.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hawk_CPPFLAGS) $(CPPFLAGS) $(hawk_CFLAGS) $(CFLAGS) -MT hawk-bin-hawk.obj -MD -MP -MF $(DEPDIR)/hawk-bin-hawk.Tpo -c -o hawk-bin-hawk.obj `if test -f 'bin-hawk.c'; then $(CYGPATH_W) 'bin-hawk.c'; else $(CYGPATH_W) '$(srcdir)/bin-hawk.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/hawk-bin-hawk.Tpo $(DEPDIR)/hawk-bin-hawk.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='bin-hawk.c' object='hawk-bin-hawk.obj' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hawk_CPPFLAGS) $(CPPFLAGS) $(hawk_CFLAGS) $(CFLAGS) -c -o hawk-main-hawk.obj `if test -f 'main-hawk.c'; then $(CYGPATH_W) 'main-hawk.c'; else $(CYGPATH_W) '$(srcdir)/main-hawk.c'; fi`
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hawk_CPPFLAGS) $(CPPFLAGS) $(hawk_CFLAGS) $(CFLAGS) -c -o hawk-bin-hawk.obj `if test -f 'bin-hawk.c'; then $(CYGPATH_W) 'bin-hawk.c'; else $(CYGPATH_W) '$(srcdir)/bin-hawk.c'; fi`
 
-hsed-main-hsed.o: main-hsed.c
-@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hsed_CPPFLAGS) $(CPPFLAGS) $(hsed_CFLAGS) $(CFLAGS) -MT hsed-main-hsed.o -MD -MP -MF $(DEPDIR)/hsed-main-hsed.Tpo -c -o hsed-main-hsed.o `test -f 'main-hsed.c' || echo '$(srcdir)/'`main-hsed.c
-@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/hsed-main-hsed.Tpo $(DEPDIR)/hsed-main-hsed.Po
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='main-hsed.c' object='hsed-main-hsed.o' libtool=no @AMDEPBACKSLASH@
+hsed-bin-hsed.o: bin-hsed.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hsed_CPPFLAGS) $(CPPFLAGS) $(hsed_CFLAGS) $(CFLAGS) -MT hsed-bin-hsed.o -MD -MP -MF $(DEPDIR)/hsed-bin-hsed.Tpo -c -o hsed-bin-hsed.o `test -f 'bin-hsed.c' || echo '$(srcdir)/'`bin-hsed.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/hsed-bin-hsed.Tpo $(DEPDIR)/hsed-bin-hsed.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='bin-hsed.c' object='hsed-bin-hsed.o' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hsed_CPPFLAGS) $(CPPFLAGS) $(hsed_CFLAGS) $(CFLAGS) -c -o hsed-main-hsed.o `test -f 'main-hsed.c' || echo '$(srcdir)/'`main-hsed.c
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hsed_CPPFLAGS) $(CPPFLAGS) $(hsed_CFLAGS) $(CFLAGS) -c -o hsed-bin-hsed.o `test -f 'bin-hsed.c' || echo '$(srcdir)/'`bin-hsed.c
 
-hsed-main-hsed.obj: main-hsed.c
-@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hsed_CPPFLAGS) $(CPPFLAGS) $(hsed_CFLAGS) $(CFLAGS) -MT hsed-main-hsed.obj -MD -MP -MF $(DEPDIR)/hsed-main-hsed.Tpo -c -o hsed-main-hsed.obj `if test -f 'main-hsed.c'; then $(CYGPATH_W) 'main-hsed.c'; else $(CYGPATH_W) '$(srcdir)/main-hsed.c'; fi`
-@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/hsed-main-hsed.Tpo $(DEPDIR)/hsed-main-hsed.Po
-@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='main-hsed.c' object='hsed-main-hsed.obj' libtool=no @AMDEPBACKSLASH@
+hsed-bin-hsed.obj: bin-hsed.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hsed_CPPFLAGS) $(CPPFLAGS) $(hsed_CFLAGS) $(CFLAGS) -MT hsed-bin-hsed.obj -MD -MP -MF $(DEPDIR)/hsed-bin-hsed.Tpo -c -o hsed-bin-hsed.obj `if test -f 'bin-hsed.c'; then $(CYGPATH_W) 'bin-hsed.c'; else $(CYGPATH_W) '$(srcdir)/bin-hsed.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/hsed-bin-hsed.Tpo $(DEPDIR)/hsed-bin-hsed.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='bin-hsed.c' object='hsed-bin-hsed.obj' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hsed_CPPFLAGS) $(CPPFLAGS) $(hsed_CFLAGS) $(CFLAGS) -c -o hsed-main-hsed.obj `if test -f 'main-hsed.c'; then $(CYGPATH_W) 'main-hsed.c'; else $(CYGPATH_W) '$(srcdir)/main-hsed.c'; fi`
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(hsed_CPPFLAGS) $(CPPFLAGS) $(hsed_CFLAGS) $(CFLAGS) -c -o hsed-bin-hsed.obj `if test -f 'bin-hsed.c'; then $(CYGPATH_W) 'bin-hsed.c'; else $(CYGPATH_W) '$(srcdir)/bin-hsed.c'; fi`
 
 mostlyclean-libtool:
 	-rm -f *.lo
@@ -654,8 +654,8 @@ clean: clean-am
 clean-am: clean-binPROGRAMS clean-generic clean-libtool mostlyclean-am
 
 distclean: distclean-am
-		-rm -f ./$(DEPDIR)/hawk-main-hawk.Po
-	-rm -f ./$(DEPDIR)/hsed-main-hsed.Po
+		-rm -f ./$(DEPDIR)/hawk-bin-hawk.Po
+	-rm -f ./$(DEPDIR)/hsed-bin-hsed.Po
 	-rm -f Makefile
 distclean-am: clean-am distclean-compile distclean-generic \
 	distclean-tags
@@ -701,8 +701,8 @@ install-ps-am:
 installcheck-am:
 
 maintainer-clean: maintainer-clean-am
-		-rm -f ./$(DEPDIR)/hawk-main-hawk.Po
-	-rm -f ./$(DEPDIR)/hsed-main-hsed.Po
+		-rm -f ./$(DEPDIR)/hawk-bin-hawk.Po
+	-rm -f ./$(DEPDIR)/hsed-bin-hsed.Po
 	-rm -f Makefile
 maintainer-clean-am: distclean-am maintainer-clean-generic
 
diff --git a/hawk/bin/main-hawk.c b/hawk/bin/bin-hawk.c
similarity index 100%
rename from hawk/bin/main-hawk.c
rename to hawk/bin/bin-hawk.c
diff --git a/hawk/bin/main-hsed.c b/hawk/bin/bin-hsed.c
similarity index 99%
rename from hawk/bin/main-hsed.c
rename to hawk/bin/bin-hsed.c
index d2d8109d..cdffaf15 100644
--- a/hawk/bin/main-hsed.c
+++ b/hawk/bin/bin-hsed.c
@@ -890,7 +890,7 @@ static HAWK_INLINE int execute_hawk_sed (int argc, hawk_bch_t* argv[])
 			out_file.u.sio = hawk_sio_open(
 				hawk_sed_getgem(sed),
 				0,
-				arg.output_file, /* ignore the type mistch error here */
+				(const hawk_ooch_t*)arg.output_file, /* fake type casting - note HAWK_SIO_BCSTRPATH below */
 				HAWK_SIO_WRITE |
 				HAWK_SIO_CREATE |
 				HAWK_SIO_TRUNCATE |
@@ -946,7 +946,7 @@ static HAWK_INLINE int execute_hawk_sed (int argc, hawk_bch_t* argv[])
 				out_inplace.u.sio = hawk_sio_open(
 					hawk_sed_getgem(sed),
 					0,
-					tmpl_tmpfile, /* expect a type mismatch warning here and note HAWK_SIO_BCSTR_PATH below */
+					(const hawk_ooch_t*)tmpl_tmpfile, /* fake type casting - note HAWK_SIO_BCSTRPATH below */
 					HAWK_SIO_WRITE |
 					HAWK_SIO_CREATE |
 					HAWK_SIO_IGNOREECERR |
diff --git a/hawk/configure b/hawk/configure
index ad548e46..ef1bdf0a 100755
--- a/hawk/configure
+++ b/hawk/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for hawk 0.9.5.
+# Generated by GNU Autoconf 2.69 for hawk 0.9.6.
 #
 # Report bugs to <Chung, Hyung-Hwan (hyunghwan.chung@gmail.com)>.
 #
@@ -590,8 +590,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='hawk'
 PACKAGE_TARNAME='hawk'
-PACKAGE_VERSION='0.9.5'
-PACKAGE_STRING='hawk 0.9.5'
+PACKAGE_VERSION='0.9.6'
+PACKAGE_STRING='hawk 0.9.6'
 PACKAGE_BUGREPORT='Chung, Hyung-Hwan (hyunghwan.chung@gmail.com)'
 PACKAGE_URL='https://code.miflux.net/@hawk'
 
@@ -639,6 +639,8 @@ HAWK_PROJECT_URL
 HAWK_PROJECT_AUTHOR
 ENABLE_MOD_UCI_FALSE
 ENABLE_MOD_UCI_TRUE
+ENABLE_MOD_SED_FALSE
+ENABLE_MOD_SED_TRUE
 ENABLE_MOD_MYSQL_FALSE
 ENABLE_MOD_MYSQL_TRUE
 ENABLE_MOD_FFI_FALSE
@@ -831,6 +833,7 @@ enable_libltdl
 enable_libunwind
 enable_mod_ffi
 enable_mod_mysql
+enable_mod_sed
 enable_mod_uci
 enable_pthread_flags
 '
@@ -1398,7 +1401,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures hawk 0.9.5 to adapt to many kinds of systems.
+\`configure' configures hawk 0.9.6 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1469,7 +1472,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of hawk 0.9.5:";;
+     short | recursive ) echo "Configuration of hawk 0.9.6:";;
    esac
   cat <<\_ACEOF
 
@@ -1505,6 +1508,7 @@ Optional Features:
   --enable-libunwind      use libunwind(default. no)
   --enable-mod-ffi        enable mod/ffi (default. yes)
   --enable-mod-mysql      enable mod/mysql (default. yes)
+  --enable-mod-sed        enable mod/sed (default. yes)
   --enable-mod-uci        enable mod/uci (default. no)
   --enable-pthread-flags  add thread flags to CFLAGS, CXXFLAGS, LIBS(default.
                           yes)
@@ -1605,7 +1609,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-hawk configure 0.9.5
+hawk configure 0.9.6
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -2389,7 +2393,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by hawk $as_me 0.9.5, which was
+It was created by hawk $as_me 0.9.6, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -3264,7 +3268,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='hawk'
- VERSION='0.9.5'
+ VERSION='0.9.6'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -24192,6 +24196,29 @@ else
 fi
 
 
+# Check whether --enable-mod-sed was given.
+if test "${enable_mod_sed+set}" = set; then :
+  enableval=$enable_mod_sed; enable_mod_sed_is=$enableval
+else
+  enable_mod_sed_is=yes
+
+fi
+
+if test "${enable_mod_sed_is}" = "yes"
+then
+
+$as_echo "#define HAWK_ENABLE_MOD_SED 1" >>confdefs.h
+
+fi
+ if test "${enable_mod_sed_is}" = "yes"; then
+  ENABLE_MOD_SED_TRUE=
+  ENABLE_MOD_SED_FALSE='#'
+else
+  ENABLE_MOD_SED_TRUE='#'
+  ENABLE_MOD_SED_FALSE=
+fi
+
+
 # Check whether --enable-mod-uci was given.
 if test "${enable_mod_uci+set}" = set; then :
   enableval=$enable_mod_uci; enable_mod_uci_is=$enableval
@@ -24419,6 +24446,10 @@ if test -z "${ENABLE_MOD_MYSQL_TRUE}" && test -z "${ENABLE_MOD_MYSQL_FALSE}"; th
   as_fn_error $? "conditional \"ENABLE_MOD_MYSQL\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${ENABLE_MOD_SED_TRUE}" && test -z "${ENABLE_MOD_SED_FALSE}"; then
+  as_fn_error $? "conditional \"ENABLE_MOD_SED\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${ENABLE_MOD_UCI_TRUE}" && test -z "${ENABLE_MOD_UCI_FALSE}"; then
   as_fn_error $? "conditional \"ENABLE_MOD_UCI\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
@@ -24820,7 +24851,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by hawk $as_me 0.9.5, which was
+This file was extended by hawk $as_me 0.9.6, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -24887,7 +24918,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-hawk config.status 0.9.5
+hawk config.status 0.9.6
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/hawk/configure.ac b/hawk/configure.ac
index c12f61e7..b12c7b7d 100644
--- a/hawk/configure.ac
+++ b/hawk/configure.ac
@@ -1,6 +1,6 @@
 dnl AC_PREREQ([2.67])
 
-AC_INIT([hawk],[0.9.5],[Chung, Hyung-Hwan (hyunghwan.chung@gmail.com)],[],[https://code.miflux.net/@hawk])
+AC_INIT([hawk],[0.9.6],[Chung, Hyung-Hwan (hyunghwan.chung@gmail.com)],[],[https://code.miflux.net/@hawk])
 
 AC_CONFIG_HEADER([lib/hawk-cfg.h])
 AC_CONFIG_AUX_DIR([ac])
@@ -1027,6 +1027,18 @@ then
 fi
 AM_CONDITIONAL(ENABLE_MOD_MYSQL, test "${enable_mod_mysql_is}" = "yes")
 
+dnl ===== enable-mod-sed =====
+AC_ARG_ENABLE([mod-sed],
+	[AS_HELP_STRING([--enable-mod-sed],[enable mod/sed (default. yes)])],
+	enable_mod_sed_is=$enableval,
+	enable_mod_sed_is=yes
+)
+if test "${enable_mod_sed_is}" = "yes"
+then
+	AC_DEFINE([HAWK_ENABLE_MOD_SED],[1],[build mod/sed])
+fi
+AM_CONDITIONAL(ENABLE_MOD_SED, test "${enable_mod_sed_is}" = "yes")
+
 dnl ===== enable-mod-uci =====
 AC_ARG_ENABLE([mod-uci],
 	[AS_HELP_STRING([--enable-mod-uci],[enable mod/uci (default. no)])],
diff --git a/hawk/lib/Makefile.am b/hawk/lib/Makefile.am
index 9fa346dc..8ed913a1 100644
--- a/hawk/lib/Makefile.am
+++ b/hawk/lib/Makefile.am
@@ -212,6 +212,10 @@ if ENABLE_MOD_MYSQL
 libhawk_la_LIBADD += ../mod/libhawk-mysql.la
 endif
 
+if ENABLE_MOD_SED
+libhawk_la_LIBADD += ../mod/libhawk-sed.la
+endif
+
 if ENABLE_MOD_UCI
 libhawk_la_LIBADD += ../mod/libhawk-uci.la
 endif
diff --git a/hawk/lib/Makefile.in b/hawk/lib/Makefile.in
index d1ace1f4..4398049b 100644
--- a/hawk/lib/Makefile.in
+++ b/hawk/lib/Makefile.in
@@ -108,11 +108,12 @@ host_triplet = @host@
 @ENABLE_STATIC_MODULE_TRUE@am__append_10 = $(SOCKET_LIBS)
 @ENABLE_MOD_FFI_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_11 = ../mod/libhawk-ffi.la
 @ENABLE_MOD_MYSQL_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_12 = ../mod/libhawk-mysql.la
-@ENABLE_MOD_UCI_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_13 = ../mod/libhawk-uci.la
+@ENABLE_MOD_SED_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_13 = ../mod/libhawk-sed.la
+@ENABLE_MOD_UCI_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_14 = ../mod/libhawk-uci.la
 
 #pkglibdir = $(libdir)
 #pkglib_LTLIBRARIES = 
-@ENABLE_STATIC_MODULE_FALSE@am__append_14 = libhawk-hawk.la \
+@ENABLE_STATIC_MODULE_FALSE@am__append_15 = libhawk-hawk.la \
 @ENABLE_STATIC_MODULE_FALSE@	libhawk-math.la libhawk-str.la \
 @ENABLE_STATIC_MODULE_FALSE@	libhawk-sys.la
 subdir = lib
@@ -226,7 +227,7 @@ libhawk_sys_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC \
 libhawk_la_DEPENDENCIES = $(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1) \
 	$(am__DEPENDENCIES_2) $(am__DEPENDENCIES_3) \
 	$(am__DEPENDENCIES_4) $(am__DEPENDENCIES_5) $(am__append_11) \
-	$(am__append_12) $(am__append_13)
+	$(am__append_12) $(am__append_13) $(am__append_14)
 am__libhawk_la_SOURCES_DIST = hawk.h hawk-arr.h hawk-chr.h hawk-cmn.h \
 	hawk-dir.h hawk-ecs.h hawk-fmt.h hawk-gem.h hawk-htb.h \
 	hawk-map.h hawk-rbt.h hawk-pack1.h hawk-skad.h hawk-utl.h \
@@ -603,7 +604,7 @@ pkginclude_HEADERS = hawk.h hawk-arr.h hawk-chr.h hawk-cmn.h \
 	hawk-map.h hawk-rbt.h hawk-pack1.h hawk-skad.h hawk-utl.h \
 	hawk-sed.h hawk-std.h hawk-tre.h hawk-unpack.h hawk-xma.h \
 	$(am__append_7)
-pkglib_LTLIBRARIES = libhawk.la $(am__append_14)
+pkglib_LTLIBRARIES = libhawk.la $(am__append_15)
 libhawk_la_SOURCES = $(pkginclude_HEADERS) arr.c chr.c dir.c ecs-imp.h \
 	ecs.c err-prv.h err.c err-sys.c fmt-imp.h fmt.c fnc-prv.h \
 	fnc.c htb.c gem.c gem-nwif.c gem-nwif2.c hawk-prv.h hawk.c \
@@ -625,7 +626,8 @@ libhawk_la_CXXFLAGS = $(CXXFLAGS_ALL_COMMON)
 libhawk_la_LDFLAGS = $(LDFLAGS_ALL_COMMON) -version-info 1:0:0 ## -no-undefined
 libhawk_la_LIBADD = $(LIBM) $(SOCKET_LIBS) $(am__append_4) \
 	$(am__append_5) $(am__append_6) $(am__append_10) \
-	$(am__append_11) $(am__append_12) $(am__append_13)
+	$(am__append_11) $(am__append_12) $(am__append_13) \
+	$(am__append_14)
 @ENABLE_CXX_FALSE@libhawk_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
 @ENABLE_CXX_FALSE@	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) \
 @ENABLE_CXX_FALSE@	$(CFLAGS) $(libhawk_la_LDFLAGS) $(LDFLAGS) -o $@
diff --git a/hawk/lib/hawk-cfg.h.in b/hawk/lib/hawk-cfg.h.in
index 938ca2b6..77199142 100644
--- a/hawk/lib/hawk-cfg.h.in
+++ b/hawk/lib/hawk-cfg.h.in
@@ -702,6 +702,9 @@
 /* build mod/mysql */
 #undef HAWK_ENABLE_MOD_MYSQL
 
+/* build mod/sed */
+#undef HAWK_ENABLE_MOD_SED
+
 /* build mod/uci */
 #undef HAWK_ENABLE_MOD_UCI
 
diff --git a/hawk/lib/parse.c b/hawk/lib/parse.c
index 194181f9..fedfe98e 100644
--- a/hawk/lib/parse.c
+++ b/hawk/lib/parse.c
@@ -7336,6 +7336,10 @@ int hawk_putsrcoochars (hawk_t* hawk, const hawk_ooch_t* str, hawk_oow_t len)
 #include "../mod/mod-mysql.h"
 #endif
 
+#if defined(HAWK_ENABLE_MOD_SED)
+#include "../mod/mod-sed.h"
+#endif
+
 #if defined(HAWK_ENABLE_MOD_UCI)
 #include "../mod/mod-uci.h"
 #endif
@@ -7359,6 +7363,9 @@ static struct
 	{ HAWK_T("math"),   hawk_mod_math },
 #if defined(HAWK_ENABLE_MOD_MYSQL)
 	{ HAWK_T("mysql"),  hawk_mod_mysql },
+#endif
+#if defined(HAWK_ENABLE_MOD_SED)
+	{ HAWK_T("sed"),    hawk_mod_sed },
 #endif
 	{ HAWK_T("str"),    hawk_mod_str },
 	{ HAWK_T("sys"),    hawk_mod_sys },
diff --git a/hawk/lib/sed.c b/hawk/lib/sed.c
index 03784d39..4e34c823 100644
--- a/hawk/lib/sed.c
+++ b/hawk/lib/sed.c
@@ -639,7 +639,7 @@ static int pickup_rex (
 		{
 			if (cmd)
 			{
-				SETERR1 (sed, HAWK_SED_ECMDIC, &cmd->type, 1, &sed->src.loc);
+				SETERR1 (sed, HAWK_SED_ECMDIC, (hawk_ooch_t*)&cmd->type, 1, &sed->src.loc);
 			}
 			else
 			{
@@ -659,7 +659,7 @@ static int pickup_rex (
 			{
 				if (cmd)
 				{
-					SETERR1 (sed, HAWK_SED_ECMDIC, &cmd->type, 1, &sed->src.loc);
+					SETERR1 (sed, HAWK_SED_ECMDIC, (hawk_ooch_t*)&cmd->type, 1, &sed->src.loc);
 				}
 				else
 				{
@@ -2347,7 +2347,7 @@ static int write_str_to_file (
 			 * it is also an error as it can't write any more */
 			sed->e.out.fun (sed, HAWK_SED_IO_CLOSE, ap, HAWK_NULL, 0);
 			ap->handle = HAWK_NULL;
-			SETERR1 (sed, HAWK_SED_EIOFIL, path, plen, &cmd->loc);
+			SETERR1 (sed, HAWK_SED_EIOFIL, (hawk_ooch_t*)path, plen, &cmd->loc);
 			return -1;
 		}
 
diff --git a/hawk/lib/std-sed.c b/hawk/lib/std-sed.c
index ae6bce5d..75d4b6d2 100644
--- a/hawk/lib/std-sed.c
+++ b/hawk/lib/std-sed.c
@@ -764,21 +764,23 @@ static hawk_ooi_t x_in (hawk_sed_t* sed, hawk_sed_io_cmd_t cmd, hawk_sed_io_arg_
 		{
 			if (arg->path == HAWK_NULL)
 			{
-				/* no file specified. console stream */
+				/* main data stream */
 				if (xtn->e.in.ptr == HAWK_NULL) 
 				{
-					/* HAWK_NULL passed into hawk_sed_exec() for input */
+					/* HAWK_NULL passed into hawk_sed_exec() for input. open stdin */
 					sio = open_sio_std(sed, HAWK_SIO_STDIN, HAWK_SIO_READ | HAWK_SIO_IGNOREECERR);
 					if (sio == HAWK_NULL) return -1;
 					arg->handle = sio;
 				}
 				else
 				{
+					/* use the input stream handlers passed to hawk_sed_exec() */
 					if (open_input_stream(sed, arg, xtn->e.in.cur, &xtn->e.in) <= -1) return -1;
 				}
 			}
 			else
 			{
+				/* sub-stream */
 				sio = open_sio_file(sed, arg->path, HAWK_SIO_READ | HAWK_SIO_IGNOREECERR);
 				if (sio == HAWK_NULL) return -1;
 				arg->handle = sio;
@@ -814,11 +816,17 @@ static hawk_ooi_t x_in (hawk_sed_t* sed, hawk_sed_io_cmd_t cmd, hawk_sed_io_arg_
 				{
 					hawk_ooi_t n;
 					n = hawk_sio_getoochars(arg->handle, buf, len);
-					if (n <= -1) hawk_sed_seterror (sed, HAWK_NULL, HAWK_SED_EIOFIL, &sio_std_names[HAWK_SIO_STDIN]);
+					if (n <= -1) 
+					{
+						const hawk_ooch_t* bem = hawk_sed_backuperrmsg(sed);
+						hawk_sed_seterrbfmt (sed, HAWK_NULL, HAWK_SED_EIOFIL, "unable to read '%js' - %js", &sio_std_names[HAWK_SIO_STDIN], bem);
+					}
 					return n;
 				}
 				else
+				{
 					return read_input_stream(sed, arg, buf, len, &xtn->e.in);
+				}
 			}
 			else
 			{
@@ -826,10 +834,8 @@ static hawk_ooi_t x_in (hawk_sed_t* sed, hawk_sed_io_cmd_t cmd, hawk_sed_io_arg_
 				n = hawk_sio_getoochars(arg->handle, buf, len);
 				if (n <= -1)
 				{
-					hawk_oocs_t ea;
-					ea.ptr = arg->path;
-					ea.len = hawk_count_oocstr(arg->path);
-					hawk_sed_seterror (sed, HAWK_NULL, HAWK_SED_EIOFIL, &ea);
+					const hawk_ooch_t* bem = hawk_sed_backuperrmsg(sed);
+					hawk_sed_seterrbfmt (sed, HAWK_NULL, HAWK_SED_EIOFIL, "unable to read '%js' - %js", arg->path, bem);
 				}
 				return n;
 			}
@@ -951,12 +957,12 @@ static hawk_ooi_t x_out (
 							return len;
 
 						default:
-							{
-								hawk_ooi_t n;
-								n = hawk_sio_putoochars(arg->handle, dat, len);
-								if (n <= -1) set_eiofil_for_iostd (sed, io);
-								return n;
-							}
+						{
+							hawk_ooi_t n;
+							n = hawk_sio_putoochars(arg->handle, dat, len);
+							if (n <= -1) set_eiofil_for_iostd (sed, io);
+							return n;
+						}
 					}
 				}
 			}
@@ -966,10 +972,8 @@ static hawk_ooi_t x_out (
 				n = hawk_sio_putoochars(arg->handle, dat, len);
 				if (n <= -1)
 				{
-					hawk_oocs_t ea;
-					ea.ptr = arg->path;
-					ea.len = hawk_count_oocstr(arg->path);
-					hawk_sed_seterror (sed, HAWK_NULL, HAWK_SED_EIOFIL, &ea);
+					const hawk_ooch_t* bem = hawk_sed_backuperrmsg(sed);
+					hawk_sed_seterrbfmt (sed, HAWK_NULL, HAWK_SED_EIOFIL, "unable to write '%js' - %js", arg->path, bem);
 				}
 				return n;
 			}
diff --git a/hawk/lib/std.c b/hawk/lib/std.c
index 5b8cd665..074b5c70 100644
--- a/hawk/lib/std.c
+++ b/hawk/lib/std.c
@@ -1591,6 +1591,9 @@ static hawk_ooi_t sf_out (hawk_t* hawk, hawk_sio_cmd_t cmd, hawk_sio_arg_t* arg,
 					xtn->s.out.u.ucs.buf = hawk_uecs_open(hawk_getgem(hawk), 0, 512);
 					if (xtn->s.out.u.ucs.buf == HAWK_NULL) return -1;
 					return 1;
+
+				default:
+					goto internal_error;
 			}
 
 			break;
@@ -1613,6 +1616,9 @@ static hawk_ooi_t sf_out (hawk_t* hawk, hawk_sio_cmd_t cmd, hawk_sio_arg_t* arg,
 					/* i don't close xtn->s.out.u.oocs.buf intentionally here.
 					 * it will be closed at the end of hawk_parsestd() */
 					return 0;
+
+				default:
+					goto internal_error;
 			}
 
 			break;
@@ -1691,6 +1697,9 @@ static hawk_ooi_t sf_out (hawk_t* hawk, hawk_sio_cmd_t cmd, hawk_sio_arg_t* arg,
 				#else
 					goto parsestd_str;
 				#endif
+
+				default:
+					goto internal_error;
 			}
 
 			break;
@@ -1701,6 +1710,7 @@ static hawk_ooi_t sf_out (hawk_t* hawk, hawk_sio_cmd_t cmd, hawk_sio_arg_t* arg,
 			break;
 	}
 
+internal_error:
 	hawk_seterrnum (hawk, HAWK_NULL, HAWK_EINTERN);
 	return -1;
 }
@@ -1776,6 +1786,10 @@ int hawk_parsestd (hawk_t* hawk, hawk_parsestd_t in[], hawk_parsestd_t* out)
 				}
 				if (xtn->s.out.u.ucs.buf) hawk_uecs_close (xtn->s.out.u.ucs.buf);
 				break;
+
+			default:
+				/* do nothing */
+				break;
 		}
 	}
 
diff --git a/hawk/mod/Makefile.am b/hawk/mod/Makefile.am
index 096514a8..8f0a9c74 100644
--- a/hawk/mod/Makefile.am
+++ b/hawk/mod/Makefile.am
@@ -29,6 +29,10 @@ if ENABLE_MOD_MYSQL
 noinst_LTLIBRARIES += libhawk-mysql.la
 endif
 
+if ENABLE_MOD_SED
+noinst_LTLIBRARIES += libhawk-sed.la
+endif
+
 if ENABLE_MOD_UCI
 noinst_LTLIBRARIES += libhawk-uci.la
 endif
@@ -54,6 +58,10 @@ if ENABLE_MOD_MYSQL
 pkgmodexec_LTLIBRARIES += libhawk-mysql.la
 endif
 
+if ENABLE_MOD_SED
+pkgmodexec_LTLIBRARIES += libhawk-sed.la
+endif
+
 if ENABLE_MOD_UCI
 pkgmodexec_LTLIBRARIES += libhawk-uci.la
 endif
@@ -82,6 +90,14 @@ libhawk_mysql_la_LDFLAGS = $(LDFLAGS_COMMON) $(MYSQL_LDFLAGS)
 libhawk_mysql_la_LIBADD = $(LIBADD_COMMON) $(MYSQL_LIBS)
 endif
 
+if ENABLE_MOD_SED
+libhawk_sed_la_SOURCES = mod-sed.c mod-sed.h
+libhawk_sed_la_CPPFLAGS = $(CPPFLAGS_COMMON)
+libhawk_sed_la_CFLAGS = $(CFLAGS_COMMON) 
+libhawk_sed_la_LDFLAGS = $(LDFLAGS_COMMON)
+libhawk_sed_la_LIBADD = $(LIBADD_COMMON)
+endif
+
 if ENABLE_MOD_UCI
 libhawk_uci_la_SOURCES = mod-uci.c mod-uci.h
 libhawk_uci_la_CPPFLAGS = $(CPPFLAGS_COMMON)
diff --git a/hawk/mod/Makefile.in b/hawk/mod/Makefile.in
index 5788ff88..112da930 100644
--- a/hawk/mod/Makefile.in
+++ b/hawk/mod/Makefile.in
@@ -90,10 +90,12 @@ build_triplet = @build@
 host_triplet = @host@
 @ENABLE_MOD_FFI_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_1 = libhawk-ffi.la
 @ENABLE_MOD_MYSQL_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_2 = libhawk-mysql.la
-@ENABLE_MOD_UCI_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_3 = libhawk-uci.la
-@ENABLE_MOD_FFI_TRUE@@ENABLE_STATIC_MODULE_FALSE@am__append_4 = libhawk-ffi.la
-@ENABLE_MOD_MYSQL_TRUE@@ENABLE_STATIC_MODULE_FALSE@am__append_5 = libhawk-mysql.la
-@ENABLE_MOD_UCI_TRUE@@ENABLE_STATIC_MODULE_FALSE@am__append_6 = libhawk-uci.la
+@ENABLE_MOD_SED_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_3 = libhawk-sed.la
+@ENABLE_MOD_UCI_TRUE@@ENABLE_STATIC_MODULE_TRUE@am__append_4 = libhawk-uci.la
+@ENABLE_MOD_FFI_TRUE@@ENABLE_STATIC_MODULE_FALSE@am__append_5 = libhawk-ffi.la
+@ENABLE_MOD_MYSQL_TRUE@@ENABLE_STATIC_MODULE_FALSE@am__append_6 = libhawk-mysql.la
+@ENABLE_MOD_SED_TRUE@@ENABLE_STATIC_MODULE_FALSE@am__append_7 = libhawk-sed.la
+@ENABLE_MOD_UCI_TRUE@@ENABLE_STATIC_MODULE_FALSE@am__append_8 = libhawk-uci.la
 subdir = mod
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/ax_check_sign.m4 \
@@ -176,6 +178,20 @@ libhawk_mysql_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC \
 @ENABLE_MOD_MYSQL_TRUE@@ENABLE_STATIC_MODULE_FALSE@	-rpath \
 @ENABLE_MOD_MYSQL_TRUE@@ENABLE_STATIC_MODULE_FALSE@	$(pkgmodexecdir)
 @ENABLE_MOD_MYSQL_TRUE@@ENABLE_STATIC_MODULE_TRUE@am_libhawk_mysql_la_rpath =
+@ENABLE_MOD_SED_TRUE@libhawk_sed_la_DEPENDENCIES =  \
+@ENABLE_MOD_SED_TRUE@	$(am__DEPENDENCIES_1)
+am__libhawk_sed_la_SOURCES_DIST = mod-sed.c mod-sed.h
+@ENABLE_MOD_SED_TRUE@am_libhawk_sed_la_OBJECTS =  \
+@ENABLE_MOD_SED_TRUE@	libhawk_sed_la-mod-sed.lo
+libhawk_sed_la_OBJECTS = $(am_libhawk_sed_la_OBJECTS)
+libhawk_sed_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC \
+	$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=link $(CCLD) \
+	$(libhawk_sed_la_CFLAGS) $(CFLAGS) $(libhawk_sed_la_LDFLAGS) \
+	$(LDFLAGS) -o $@
+@ENABLE_MOD_SED_TRUE@@ENABLE_STATIC_MODULE_FALSE@am_libhawk_sed_la_rpath =  \
+@ENABLE_MOD_SED_TRUE@@ENABLE_STATIC_MODULE_FALSE@	-rpath \
+@ENABLE_MOD_SED_TRUE@@ENABLE_STATIC_MODULE_FALSE@	$(pkgmodexecdir)
+@ENABLE_MOD_SED_TRUE@@ENABLE_STATIC_MODULE_TRUE@am_libhawk_sed_la_rpath =
 @ENABLE_MOD_UCI_TRUE@libhawk_uci_la_DEPENDENCIES =  \
 @ENABLE_MOD_UCI_TRUE@	$(am__DEPENDENCIES_1) \
 @ENABLE_MOD_UCI_TRUE@	$(am__DEPENDENCIES_1)
@@ -208,6 +224,7 @@ depcomp = $(SHELL) $(top_srcdir)/ac/depcomp
 am__maybe_remake_depfiles = depfiles
 am__depfiles_remade = ./$(DEPDIR)/libhawk_ffi_la-mod-ffi.Plo \
 	./$(DEPDIR)/libhawk_mysql_la-mod-mysql.Plo \
+	./$(DEPDIR)/libhawk_sed_la-mod-sed.Plo \
 	./$(DEPDIR)/libhawk_uci_la-mod-uci.Plo
 am__mv = mv -f
 COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
@@ -229,9 +246,10 @@ am__v_CCLD_ = $(am__v_CCLD_@AM_DEFAULT_V@)
 am__v_CCLD_0 = @echo "  CCLD    " $@;
 am__v_CCLD_1 = 
 SOURCES = $(libhawk_ffi_la_SOURCES) $(libhawk_mysql_la_SOURCES) \
-	$(libhawk_uci_la_SOURCES)
+	$(libhawk_sed_la_SOURCES) $(libhawk_uci_la_SOURCES)
 DIST_SOURCES = $(am__libhawk_ffi_la_SOURCES_DIST) \
 	$(am__libhawk_mysql_la_SOURCES_DIST) \
+	$(am__libhawk_sed_la_SOURCES_DIST) \
 	$(am__libhawk_uci_la_SOURCES_DIST)
 am__can_run_installinfo = \
   case $$AM_UPDATE_INFO_DIR in \
@@ -435,10 +453,12 @@ CFLAGS_COMMON =
 @ENABLE_STATIC_MODULE_FALSE@LIBADD_COMMON = -lhawk
 @ENABLE_STATIC_MODULE_TRUE@LIBADD_COMMON = 
 @ENABLE_STATIC_MODULE_TRUE@noinst_LTLIBRARIES = $(am__append_1) \
-@ENABLE_STATIC_MODULE_TRUE@	$(am__append_2) $(am__append_3)
+@ENABLE_STATIC_MODULE_TRUE@	$(am__append_2) $(am__append_3) \
+@ENABLE_STATIC_MODULE_TRUE@	$(am__append_4)
 @ENABLE_STATIC_MODULE_FALSE@pkgmodexecdir = $(libdir)
-@ENABLE_STATIC_MODULE_FALSE@pkgmodexec_LTLIBRARIES = $(am__append_4) \
-@ENABLE_STATIC_MODULE_FALSE@	$(am__append_5) $(am__append_6)
+@ENABLE_STATIC_MODULE_FALSE@pkgmodexec_LTLIBRARIES = $(am__append_5) \
+@ENABLE_STATIC_MODULE_FALSE@	$(am__append_6) $(am__append_7) \
+@ENABLE_STATIC_MODULE_FALSE@	$(am__append_8)
 
 ##################################################
 ##################################################
@@ -456,6 +476,11 @@ CFLAGS_COMMON =
 @ENABLE_MOD_MYSQL_TRUE@libhawk_mysql_la_CFLAGS = $(CFLAGS_COMMON) 
 @ENABLE_MOD_MYSQL_TRUE@libhawk_mysql_la_LDFLAGS = $(LDFLAGS_COMMON) $(MYSQL_LDFLAGS)
 @ENABLE_MOD_MYSQL_TRUE@libhawk_mysql_la_LIBADD = $(LIBADD_COMMON) $(MYSQL_LIBS)
+@ENABLE_MOD_SED_TRUE@libhawk_sed_la_SOURCES = mod-sed.c mod-sed.h
+@ENABLE_MOD_SED_TRUE@libhawk_sed_la_CPPFLAGS = $(CPPFLAGS_COMMON)
+@ENABLE_MOD_SED_TRUE@libhawk_sed_la_CFLAGS = $(CFLAGS_COMMON) 
+@ENABLE_MOD_SED_TRUE@libhawk_sed_la_LDFLAGS = $(LDFLAGS_COMMON)
+@ENABLE_MOD_SED_TRUE@libhawk_sed_la_LIBADD = $(LIBADD_COMMON)
 @ENABLE_MOD_UCI_TRUE@libhawk_uci_la_SOURCES = mod-uci.c mod-uci.h
 @ENABLE_MOD_UCI_TRUE@libhawk_uci_la_CPPFLAGS = $(CPPFLAGS_COMMON)
 @ENABLE_MOD_UCI_TRUE@libhawk_uci_la_CFLAGS = $(CFLAGS_COMMON) 
@@ -547,6 +572,9 @@ libhawk-ffi.la: $(libhawk_ffi_la_OBJECTS) $(libhawk_ffi_la_DEPENDENCIES) $(EXTRA
 libhawk-mysql.la: $(libhawk_mysql_la_OBJECTS) $(libhawk_mysql_la_DEPENDENCIES) $(EXTRA_libhawk_mysql_la_DEPENDENCIES) 
 	$(AM_V_CCLD)$(libhawk_mysql_la_LINK) $(am_libhawk_mysql_la_rpath) $(libhawk_mysql_la_OBJECTS) $(libhawk_mysql_la_LIBADD) $(LIBS)
 
+libhawk-sed.la: $(libhawk_sed_la_OBJECTS) $(libhawk_sed_la_DEPENDENCIES) $(EXTRA_libhawk_sed_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libhawk_sed_la_LINK) $(am_libhawk_sed_la_rpath) $(libhawk_sed_la_OBJECTS) $(libhawk_sed_la_LIBADD) $(LIBS)
+
 libhawk-uci.la: $(libhawk_uci_la_OBJECTS) $(libhawk_uci_la_DEPENDENCIES) $(EXTRA_libhawk_uci_la_DEPENDENCIES) 
 	$(AM_V_CCLD)$(libhawk_uci_la_LINK) $(am_libhawk_uci_la_rpath) $(libhawk_uci_la_OBJECTS) $(libhawk_uci_la_LIBADD) $(LIBS)
 
@@ -558,6 +586,7 @@ distclean-compile:
 
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhawk_ffi_la-mod-ffi.Plo@am__quote@ # am--include-marker
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhawk_mysql_la-mod-mysql.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhawk_sed_la-mod-sed.Plo@am__quote@ # am--include-marker
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libhawk_uci_la-mod-uci.Plo@am__quote@ # am--include-marker
 
 $(am__depfiles_remade):
@@ -604,6 +633,13 @@ libhawk_mysql_la-mod-mysql.lo: mod-mysql.c
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhawk_mysql_la_CPPFLAGS) $(CPPFLAGS) $(libhawk_mysql_la_CFLAGS) $(CFLAGS) -c -o libhawk_mysql_la-mod-mysql.lo `test -f 'mod-mysql.c' || echo '$(srcdir)/'`mod-mysql.c
 
+libhawk_sed_la-mod-sed.lo: mod-sed.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhawk_sed_la_CPPFLAGS) $(CPPFLAGS) $(libhawk_sed_la_CFLAGS) $(CFLAGS) -MT libhawk_sed_la-mod-sed.lo -MD -MP -MF $(DEPDIR)/libhawk_sed_la-mod-sed.Tpo -c -o libhawk_sed_la-mod-sed.lo `test -f 'mod-sed.c' || echo '$(srcdir)/'`mod-sed.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libhawk_sed_la-mod-sed.Tpo $(DEPDIR)/libhawk_sed_la-mod-sed.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='mod-sed.c' object='libhawk_sed_la-mod-sed.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhawk_sed_la_CPPFLAGS) $(CPPFLAGS) $(libhawk_sed_la_CFLAGS) $(CFLAGS) -c -o libhawk_sed_la-mod-sed.lo `test -f 'mod-sed.c' || echo '$(srcdir)/'`mod-sed.c
+
 libhawk_uci_la-mod-uci.lo: mod-uci.c
 @am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhawk_uci_la_CPPFLAGS) $(CPPFLAGS) $(libhawk_uci_la_CFLAGS) $(CFLAGS) -MT libhawk_uci_la-mod-uci.lo -MD -MP -MF $(DEPDIR)/libhawk_uci_la-mod-uci.Tpo -c -o libhawk_uci_la-mod-uci.lo `test -f 'mod-uci.c' || echo '$(srcdir)/'`mod-uci.c
 @am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libhawk_uci_la-mod-uci.Tpo $(DEPDIR)/libhawk_uci_la-mod-uci.Plo
@@ -747,6 +783,7 @@ clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
 distclean: distclean-am
 		-rm -f ./$(DEPDIR)/libhawk_ffi_la-mod-ffi.Plo
 	-rm -f ./$(DEPDIR)/libhawk_mysql_la-mod-mysql.Plo
+	-rm -f ./$(DEPDIR)/libhawk_sed_la-mod-sed.Plo
 	-rm -f ./$(DEPDIR)/libhawk_uci_la-mod-uci.Plo
 	-rm -f Makefile
 distclean-am: clean-am distclean-compile distclean-generic \
@@ -795,6 +832,7 @@ installcheck-am:
 maintainer-clean: maintainer-clean-am
 		-rm -f ./$(DEPDIR)/libhawk_ffi_la-mod-ffi.Plo
 	-rm -f ./$(DEPDIR)/libhawk_mysql_la-mod-mysql.Plo
+	-rm -f ./$(DEPDIR)/libhawk_sed_la-mod-sed.Plo
 	-rm -f ./$(DEPDIR)/libhawk_uci_la-mod-uci.Plo
 	-rm -f Makefile
 maintainer-clean-am: distclean-am maintainer-clean-generic
diff --git a/hawk/mod/mod-sed.c b/hawk/mod/mod-sed.c
new file mode 100644
index 00000000..8da838b6
--- /dev/null
+++ b/hawk/mod/mod-sed.c
@@ -0,0 +1,268 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2020 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "mod-sed.h"
+#include "../lib/sed-prv.h"
+
+#if 0
+static int fnc_errno (hawk_rtx_t* rtx, const hawk_fnc_info_t* fi)
+{
+	uctx_list_t* list;
+	hawk_val_t* retv;
+
+	list = rtx_to_list (rtx, fi);
+
+	retv = hawk_rtx_makeintval (rtx, list->errnum);
+	if (retv == HAWK_NULL) return -1;
+
+	hawk_rtx_setretval (rtx, retv);
+	return 0;
+}
+
+static hawk_ooch_t* errmsg[] =
+{
+	HAWK_T("no error"),
+	HAWK_T("out of memory"),
+	HAWK_T("invalid data"),
+	HAWK_T("not found"),
+	HAWK_T("I/O error"),
+	HAWK_T("parse error"),
+	HAWK_T("duplicate data"),
+	HAWK_T("unknown error")
+};
+
+static int fnc_errstr (hawk_rtx_t* rtx, const hawk_fnc_info_t* fi)
+{
+	hawk_val_t* retv;
+	hawk_int_t errnum;
+
+/*
+	list = rtx_to_list (rtx, fi);
+
+	if (hawk_rtx_getnargs (rtx) <= 0 ||
+	    hawk_rtx_valtoint (rtx, hawk_rtx_getarg (rtx, 0), &errnum) <= -1)
+	{
+		errnum = list->errnum;
+	}
+*/
+
+	ret = hawk_rtx_valtoint (rtx, hawk_rtx_getarg (rtx, 0), &id);
+	if (ret <= -1) errnum = -1;
+
+
+	if (errnum < 0 || errnum >= HAWK_COUNTOF(errmsg)) errnum = HAWK_COUNTOF(errmsg) - 1;
+
+	retv = hawk_rtx_makestrvalwithstr (rtx, errmsg[errnum]);
+	if (retv == HAWK_NULL) return -1;
+
+	hawk_rtx_setretval (rtx, retv);
+	return 0;
+}
+#endif
+
+static int fnc_file_to_file (hawk_rtx_t* rtx, const hawk_fnc_info_t* fi)
+{
+	hawk_sed_t* sed = HAWK_NULL;
+	hawk_val_t* retv;
+	hawk_val_t* a[3];
+	hawk_oocs_t xstr[3];
+	int i = 0, ret = 0;
+
+	/* result = sed::file_to_file ("s/ABC/123/g", input_file, output_file [, option_string]) */
+
+	sed = hawk_sed_openstdwithmmgr(hawk_rtx_getgem(rtx), 0, hawk_rtx_getcmgr(rtx), HAWK_NULL);
+	if (sed == HAWK_NULL) 
+	{
+		ret = -2;
+		goto oops;
+	}
+
+/* TODO hawk_set_opt (TRAIT) using the optional parameter */
+
+	for (i = 0; i < 3; i++)
+	{
+		a[i] = hawk_rtx_getarg(rtx, i);
+		xstr[i].ptr = hawk_rtx_getvaloocstr(rtx, a[i], &xstr[i].len);
+		if (xstr[i].ptr == HAWK_NULL) 
+		{
+			ret = -2;
+			goto oops;
+		}
+	}
+
+	if (hawk_sed_compstdoocs(sed, &xstr[0]) <= -1) 
+	{
+		ret = -3; /* compile error */
+		goto oops;
+	}
+
+	if (hawk_sed_execstdfile(sed, xstr[1].ptr, xstr[2].ptr, HAWK_NULL) <= -1) 
+	{
+		ret = -4;
+		goto oops;
+	}
+
+oops:
+	retv = hawk_rtx_makeintval(rtx, ret);
+	if (retv == HAWK_NULL) retv = hawk_rtx_makeintval(rtx, -1);
+
+	while (i > 0)
+	{
+		--i;
+		hawk_rtx_freevaloocstr (rtx, a[i], xstr[i].ptr);
+	}
+
+	if (sed) hawk_sed_close (sed);
+	hawk_rtx_setretval (rtx, retv);
+	return 0;
+}
+
+static int fnc_str_to_str (hawk_rtx_t* rtx, const hawk_fnc_info_t* fi)
+{
+	hawk_sed_t* sed = HAWK_NULL;
+	hawk_val_t* retv;
+	hawk_val_t* a[2], * tmp;
+	hawk_oocs_t xstr[2];
+	hawk_oocs_t outstr;
+	int i = 0, ret = 0, n;
+
+	sed = hawk_sed_openstdwithmmgr (hawk_rtx_getmmgr(rtx), 0, hawk_rtx_getcmgr(rtx), HAWK_NULL);
+	if (sed == HAWK_NULL) 
+	{
+		ret = -2;
+		goto oops;
+	}
+
+/* TODO hawk_set_opt (TRAIT) using the optional parameter */
+
+	for (i = 0; i < 2; i++)
+	{
+		a[i] = hawk_rtx_getarg(rtx, i);
+		xstr[i].ptr = hawk_rtx_getvaloocstr(rtx, a[i], &xstr[i].len);
+		if (xstr[i].ptr == HAWK_NULL) 
+		{
+			ret = -2;
+			goto oops;
+		}
+	}
+
+	if (hawk_sed_compstdoocs(sed, &xstr[0]) <= -1) 
+	{
+		ret = -3; /* compile error */
+		goto oops;
+	}
+
+	if (hawk_sed_execstdxstr (sed, &xstr[1], &outstr, HAWK_NULL) <= -1) 
+	{
+		ret = -4;
+		goto oops;
+	}
+
+	tmp = hawk_rtx_makestrvalwithoocs(rtx, &outstr);
+	hawk_sed_freemem (sed, outstr.ptr);
+
+	if (!tmp)
+	{
+		ret = -1;
+		goto oops;
+	}
+
+	hawk_rtx_refupval (rtx, tmp);
+	n = hawk_rtx_setrefval(rtx, (hawk_val_ref_t*)hawk_rtx_getarg (rtx, 2), tmp);
+	hawk_rtx_refdownval (rtx, tmp);
+	if (n <= -1)
+	{
+		ret = -5;
+		goto oops;
+	}
+
+oops:
+	retv = hawk_rtx_makeintval(rtx, ret);
+	if (retv == HAWK_NULL) retv = hawk_rtx_makeintval(rtx, -1);
+
+	while (i > 0)
+	{
+		--i;
+		hawk_rtx_freevaloocstr (rtx, a[i], xstr[i].ptr);
+	}
+
+	if (sed) hawk_sed_close (sed);
+	hawk_rtx_setretval (rtx, retv);
+	return 0;
+}
+
+typedef struct fnctab_t fnctab_t;
+struct fnctab_t
+{
+	const hawk_ooch_t* name;
+	hawk_mod_sym_fnc_t info;
+};
+
+static fnctab_t fnctab[] =
+{
+	/* keep this table sorted for binary search in query(). */
+	{ HAWK_T("file_to_file"),  { { 3, 3, HAWK_NULL },    fnc_file_to_file,  0 } },
+	{ HAWK_T("str_to_str"),    { { 3, 3, HAWK_T("vvr")}, fnc_str_to_str,    0 } }
+};
+
+/* ------------------------------------------------------------------------ */
+
+static int query (hawk_mod_t* mod, hawk_t* hawk, const hawk_ooch_t* name, hawk_mod_sym_t* sym)
+{	
+	return hawk_findmodsymfnc(hawk, fnctab, HAWK_COUNTOF(fnctab), name, sym);
+}
+
+/* TODO: proper resource management */
+
+static int init (hawk_mod_t* mod, hawk_rtx_t* rtx)
+{
+	return 0;
+}
+
+static void fini (hawk_mod_t* mod, hawk_rtx_t* rtx)
+{
+	/* TODO: anything? */
+}
+
+static void unload (hawk_mod_t* mod, hawk_t* hawk)
+{
+	/* TODO: anything? */
+}
+
+int hawk_mod_sed (hawk_mod_t* mod, hawk_t* hawk)
+{
+	hawk_ntime_t tv;
+
+	mod->query = query;
+	mod->unload = unload;
+
+	mod->init = init;
+	mod->fini = fini;
+	mod->ctx = HAWK_NULL;
+
+	return 0;
+}
+
diff --git a/hawk/mod/mod-sed.h b/hawk/mod/mod-sed.h
new file mode 100644
index 00000000..43770381
--- /dev/null
+++ b/hawk/mod/mod-sed.h
@@ -0,0 +1,43 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2020 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _HAWK_MOD_SED_H_
+#define _HAWK_MOD_SED_H_
+
+#include <hawk.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+HAWK_EXPORT int hawk_mod_sed (hawk_mod_t* mod, hawk_t* hawk);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+
diff --git a/hawk/t/Makefile.am b/hawk/t/Makefile.am
index 6fc431bc..f52871cb 100644
--- a/hawk/t/Makefile.am
+++ b/hawk/t/Makefile.am
@@ -13,7 +13,7 @@ LDFLAGS_COMMON=-L$(abs_builddir)/../lib  -L$(libdir)
 ## for more information.
 LIBADD_COMMON = ../lib/libhawk.la $(LIBM)
 
-check_SCRIPTS = h-001.hawk h-002.hawk h-003.hawk
+check_SCRIPTS = h-001.hawk h-002.hawk h-003.hawk h-009.hawk
 ##noinst_SCRIPTS = $(check_SCRIPTS)
 EXTRA_DIST = $(check_SCRIPTS) ensure.inc \
 	journal-toc.hawk journal-toc.in journal-toc.out journal-toc-html.out \
diff --git a/hawk/t/Makefile.in b/hawk/t/Makefile.in
index 5ee92f28..25638227 100644
--- a/hawk/t/Makefile.in
+++ b/hawk/t/Makefile.in
@@ -577,7 +577,7 @@ CPPFLAGS_COMMON = \
 CFLAGS_COMMON = 
 LDFLAGS_COMMON = -L$(abs_builddir)/../lib  -L$(libdir)
 LIBADD_COMMON = ../lib/libhawk.la $(LIBM)
-check_SCRIPTS = h-001.hawk h-002.hawk h-003.hawk
+check_SCRIPTS = h-001.hawk h-002.hawk h-003.hawk h-009.hawk
 EXTRA_DIST = $(check_SCRIPTS) ensure.inc \
 	journal-toc.hawk journal-toc.in journal-toc.out journal-toc-html.out \
 	bibtex-to-html.hawk bibtex-to-html.out
diff --git a/hawk/t/h-009.hawk b/hawk/t/h-009.hawk
new file mode 100644
index 00000000..0b7daadf
--- /dev/null
+++ b/hawk/t/h-009.hawk
@@ -0,0 +1,19 @@
+@pragma entry main
+@pragma implicit off
+
+@include "ensure.inc";
+
+function run_test_001 ()
+{
+	@local tmp, out;
+
+	tmp = sed::str_to_str("s/a/j/g", "aaabbbaaacccaaaddd", out);
+	ensure (out === "jjjbbbjjjcccjjjddd", 1, @SCRIPTNAME, @SCRIPTLINE);
+}
+
+function main()
+{
+	run_test_001 ();
+	print "SUCCESS";
+}
+