diff --git a/qse/include/qse/cmn/str.h b/qse/include/qse/cmn/str.h
index 77f59707..ce576642 100644
--- a/qse/include/qse/cmn/str.h
+++ b/qse/include/qse/cmn/str.h
@@ -1,5 +1,5 @@
 /*
- * $Id: str.h 127 2009-05-07 13:15:04Z hyunghwan.chung $
+ * $Id: str.h 138 2009-05-17 09:35:16Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -539,6 +539,12 @@ qse_size_t qse_str_nccat (
 	qse_size_t len
 );
 
+qse_size_t qse_str_del (
+	qse_str_t* str,
+	qse_size_t index,
+	qse_size_t size
+);
+
 /****f* Common/qse_strspl
  * NAME
  *  qse_strspl - split a string into fields
diff --git a/qse/lib/cmn/str_dyn.c b/qse/lib/cmn/str_dyn.c
index 83a9d414..170c7af1 100644
--- a/qse/lib/cmn/str_dyn.c
+++ b/qse/lib/cmn/str_dyn.c
@@ -1,5 +1,5 @@
 /*
- * $Id: str_dyn.c 126 2009-05-05 02:12:38Z hyunghwan.chung $
+ * $Id: str_dyn.c 138 2009-05-17 09:35:16Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -311,3 +311,24 @@ qse_size_t qse_str_nccat (qse_str_t* str, qse_char_t c, qse_size_t len)
 	return str->len;
 }
 
+qse_size_t qse_str_del (qse_str_t* str, qse_size_t index, qse_size_t size)
+{
+	if (str->ptr != QSE_NULL && index < str->len && size > 0)
+	{
+		qse_size_t nidx = index + size;
+		if (nidx >= str->len)
+		{
+			str->ptr[index] = QSE_T('\0');
+			str->len = index;
+		}
+		else
+		{
+			qse_strncpy (
+				&str->ptr[index], &str->ptr[nidx],
+				str->len - nidx);
+			str->len -= size;
+		}
+	}
+
+	return str->len;
+}
diff --git a/qse/lib/utl/sed.c b/qse/lib/utl/sed.c
index 75bda74b..81260900 100644
--- a/qse/lib/utl/sed.c
+++ b/qse/lib/utl/sed.c
@@ -246,6 +246,14 @@ static void free_command (qse_sed_t* sed, qse_sed_cmd_t* cmd)
 				QSE_MMGR_FREE (sed->mmgr, cmd->u.text.ptr);
 			break;
 
+		case QSE_SED_CMD_READ_FILE:
+		case QSE_SED_CMD_READ_FILELN:
+		case QSE_SED_CMD_WRITE_FILE:
+		case QSE_SED_CMD_WRITE_FILELN:
+			if (cmd->u.file.ptr != QSE_NULL)
+				QSE_MMGR_FREE (sed->mmgr, cmd->u.file.ptr);
+			break;
+
 		case QSE_SED_CMD_BRANCH:
 		case QSE_SED_CMD_BRANCH_COND:
 			if (cmd->u.branch.label.ptr != QSE_NULL) 
@@ -266,14 +274,6 @@ static void free_command (qse_sed_t* sed, qse_sed_cmd_t* cmd)
 				QSE_MMGR_FREE (sed->mmgr, cmd->u.transet.ptr);
 			break;
 
-		case QSE_SED_CMD_READ_FILE:
-		case QSE_SED_CMD_READ_FILELN:
-		case QSE_SED_CMD_WRITE_FILE:
-		case QSE_SED_CMD_WRITE_FILELN:
-			if (cmd->u.file.ptr != QSE_NULL)
-				QSE_MMGR_FREE (sed->mmgr, cmd->u.file.ptr);
-			break;
-
 		default: 
 			break;
 	}
@@ -1848,9 +1848,10 @@ static int do_subst (qse_sed_t* sed, qse_sed_cmd_t* cmd)
 			);
 			if (n <= -1) return -1;
 		}
+
+		sed->e.subst_done = 1;
 	}
 
-	sed->e.subst_done = 1;
 	return 0;
 }
 
@@ -2065,6 +2066,25 @@ static qse_sed_cmd_t* exec_cmd (qse_sed_t* sed, qse_sed_cmd_t* cmd)
 
 			break;
 
+		case QSE_SED_CMD_DELETE_FIRSTLN:
+		{
+			qse_char_t* nl;
+
+			/* delete the first line from the pattern space */
+			nl = qse_strxchr (
+				QSE_STR_PTR(&sed->e.in.line),
+				QSE_STR_LEN(&sed->e.in.line),
+				QSE_T('\n'));
+			if (nl != QSE_NULL) 
+			{
+				/* if a new line is found */
+				qse_str_del (&sed->e.in.line, 0, 
+					nl - QSE_STR_PTR(&sed->e.in.line) + 1);	
+				break;
+			}
+
+			/* otherwise clear the entire pattern space below */
+		}
 		case QSE_SED_CMD_DELETE:
 			/* delete the pattern space */
 			qse_str_clear (&sed->e.in.line);
@@ -2261,6 +2281,11 @@ static qse_sed_cmd_t* exec_cmd (qse_sed_t* sed, qse_sed_cmd_t* cmd)
 			jumpto = cmd->u.branch.target;
 			break;
 
+		case QSE_SED_CMD_SUBSTITUTE:
+			n = do_subst (sed, cmd);
+			if (n <= -1) return QSE_NULL;
+			break;
+
 		case QSE_SED_CMD_TRANSLATE:
 		{
 			qse_char_t* ptr = QSE_STR_PTR(&sed->e.in.line);
@@ -2286,11 +2311,6 @@ static qse_sed_cmd_t* exec_cmd (qse_sed_t* sed, qse_sed_cmd_t* cmd)
 			}
 			break;
 		}
-
-		case QSE_SED_CMD_SUBSTITUTE:
-			n = do_subst (sed, cmd);
-			if (n <= -1) return QSE_NULL;
-			break;
 	}
 
 	if (jumpto == QSE_NULL) jumpto = cmd + 1;
diff --git a/qse/lib/utl/sed.h b/qse/lib/utl/sed.h
index 46e52c58..9341a53d 100644
--- a/qse/lib/utl/sed.h
+++ b/qse/lib/utl/sed.h
@@ -48,15 +48,15 @@ struct qse_sed_cmd_t
 {
 	enum
 	{
-		QSE_SED_CMD_QUIT       = QSE_T('q'),
-		QSE_SED_CMD_QUIT_QUIET = QSE_T('Q'),
+		QSE_SED_CMD_QUIT           = QSE_T('q'),
+		QSE_SED_CMD_QUIT_QUIET     = QSE_T('Q'),
 
-		QSE_SED_CMD_APPEND = QSE_T('a'),
-		QSE_SED_CMD_INSERT = QSE_T('i'),
-		QSE_SED_CMD_CHANGE = QSE_T('c'),
+		QSE_SED_CMD_APPEND         = QSE_T('a'),
+		QSE_SED_CMD_INSERT         = QSE_T('i'),
+		QSE_SED_CMD_CHANGE         = QSE_T('c'),
 
-		QSE_SED_CMD_DELETE = QSE_T('d'),
-		QSE_SED_CMD_DD     = QSE_T('D'),
+		QSE_SED_CMD_DELETE         = QSE_T('d'),
+		QSE_SED_CMD_DELETE_FIRSTLN = QSE_T('D'),
 
 		QSE_SED_CMD_PRINT_LNNUM    = QSE_T('='),
 		QSE_SED_CMD_PRINT          = QSE_T('p'),
@@ -72,14 +72,14 @@ struct qse_sed_cmd_t
 		QSE_SED_CMD_NEXT           = QSE_T('n'),
 		QSE_SED_CMD_NEXT_APPEND    = QSE_T('N'),
 
-		QSE_SED_CMD_BRANCH         = QSE_T('b'), 
-		QSE_SED_CMD_BRANCH_COND    = QSE_T('t'),
-
 		QSE_SED_CMD_READ_FILE      = QSE_T('r'),
 		QSE_SED_CMD_READ_FILELN    = QSE_T('R'),
 		QSE_SED_CMD_WRITE_FILE     = QSE_T('w'),
 		QSE_SED_CMD_WRITE_FILELN   = QSE_T('W'),
 
+		QSE_SED_CMD_BRANCH         = QSE_T('b'), 
+		QSE_SED_CMD_BRANCH_COND    = QSE_T('t'),
+
 		QSE_SED_CMD_SUBSTITUTE     = QSE_T('s'),
 		QSE_SED_CMD_TRANSLATE      = QSE_T('y')
 
diff --git a/qse/test/cmn/str.c b/qse/test/cmn/str.c
index 3023b9dc..d32459e2 100644
--- a/qse/test/cmn/str.c
+++ b/qse/test/cmn/str.c
@@ -527,6 +527,29 @@ static int test12 (void)
 	return 0;
 }
 
+static int test13 (void)
+{
+	qse_char_t a1[] = QSE_T("abcdefghijklmnopqrstuvwxyz");
+	qse_str_t x;
+	int i;
+
+	qse_str_init (&x, QSE_MMGR_GETDFL(), 5);
+
+	for (i = 1; i < 20; i++)
+	{
+		qse_str_cpy (&x, a1);
+		qse_str_del (&x, 10, i);
+		qse_printf (QSE_T("deleleted %d from 10 => %llu [%s]\n"), 
+			i,
+			(unsigned long long)QSE_STR_LEN(&x),
+			QSE_STR_PTR(&x));
+	}
+
+	qse_str_fini (&x);
+	return 0;
+}
+
+
 int main ()
 {
 	setlocale (LC_ALL, "");
@@ -547,6 +570,7 @@ int main ()
 	R (test10);
 	R (test11);
 	R (test12);
+	R (test13);
 
 	return 0;
 }