diff --git a/hawk/README.md b/hawk/README.md
index e897a463..443c5af5 100644
--- a/hawk/README.md
+++ b/hawk/README.md
@@ -1,13 +1,9 @@
 # Hawk
 
-# Table of Contents
 - [Language](#language)
+- [Basic Modules](#basic-modules)
 - [Embedding Guide](#embedding-guide)
 
-#### TODO: unary bitwise not
-#### TODO: fix -F or --field-separator to hawk.
-
-
 ## Language <a name="language"></a>
 
 Hawk implements most of the AWK programming language elements with extensions.
@@ -63,4 +59,12 @@ BEGIN { x[3]=99; q(x); for (i in x) print i, x[i]; }'
 </pre>
 
 
+## Basic Modules <a name="basic-modules"></a>
+
+### sys
+
+### ffi
+
+### mysql
+
 ## Embedding Guide <a name="embedding-guide"></a>
diff --git a/hawk/lib/parse.c b/hawk/lib/parse.c
index 7d33357b..7f5c92bc 100644
--- a/hawk/lib/parse.c
+++ b/hawk/lib/parse.c
@@ -97,7 +97,7 @@ enum tok_t
 	TOK_LT,
 	TOK_GE,
 	TOK_GT,
-	TOK_MA,   /* ~ - match */
+	TOK_TILDE,   /* ~ - match or bitwise negation */
 	TOK_NM,   /* !~ -  not match */
 	TOK_LNOT, /* ! - logical negation */
 	TOK_PLUS,
@@ -113,7 +113,6 @@ enum tok_t
 	TOK_BOR,
 	TOK_BXOR, /* ^^ - bitwise-xor */
 	TOK_BAND,
-	TOK_BNOT, /* ~~ - used for unary bitwise-not */
 	TOK_RS,
 	TOK_LS,
 	TOK_IN,
@@ -4058,7 +4057,7 @@ static hawk_nde_t* parse_in (hawk_t* awk, const hawk_loc_t* xloc)
 		if (get_token(awk) <= -1) goto oops;
 
 		rloc = awk->tok.loc;
-		right = parse_regex_match (awk, &rloc);
+		right = parse_regex_match(awk, &rloc);
 		if (right == HAWK_NULL)  goto oops;
 
 		if (!is_plain_var(right))
@@ -4088,7 +4087,7 @@ static hawk_nde_t* parse_regex_match (hawk_t* awk, const hawk_loc_t* xloc)
 {
 	static binmap_t map[] =
 	{
-		{ TOK_MA,  HAWK_BINOP_MA },
+		{ TOK_TILDE,  HAWK_BINOP_MA },
 		{ TOK_NM,  HAWK_BINOP_NM },
 		{ TOK_EOF, 0 },
 	};
@@ -4191,7 +4190,7 @@ static hawk_nde_t* parse_concat (hawk_t* awk, const hawk_loc_t* xloc)
 			if (MATCH(awk,TOK_LPAREN) || MATCH(awk,TOK_DOLLAR) ||
 			   /* unary operators */
 			   MATCH(awk,TOK_PLUS) || MATCH(awk,TOK_MINUS) ||
-			   MATCH(awk,TOK_LNOT) || MATCH(awk,TOK_BNOT) || 
+			   MATCH(awk,TOK_LNOT) ||/* MATCH(awk,TOK_TILDE) ||*/
 			   /* increment operators */
 			   MATCH(awk,TOK_PLUSPLUS) || MATCH(awk,TOK_MINUSMINUS) ||
 			   ((awk->opt.trait & HAWK_TOLERANT) && 
@@ -4261,7 +4260,7 @@ static hawk_nde_t* parse_unary (hawk_t* awk, const hawk_loc_t* xloc)
 	opcode = (MATCH(awk,TOK_PLUS))?  HAWK_UNROP_PLUS:
 	         (MATCH(awk,TOK_MINUS))? HAWK_UNROP_MINUS:
 	         (MATCH(awk,TOK_LNOT))?  HAWK_UNROP_LNOT:
-	         (MATCH(awk,TOK_BNOT))?  HAWK_UNROP_BNOT: -1;
+	         (MATCH(awk,TOK_TILDE))? HAWK_UNROP_BNOT: -1;
 
 	/*if (opcode <= -1) return parse_increment (awk);*/
 	if (opcode <= -1) return parse_exponent (awk, xloc);
@@ -4408,7 +4407,7 @@ static hawk_nde_t* parse_unary_exp (hawk_t* awk, const hawk_loc_t* xloc)
 	opcode = (MATCH(awk,TOK_PLUS))?  HAWK_UNROP_PLUS:
 	         (MATCH(awk,TOK_MINUS))? HAWK_UNROP_MINUS:
 	         (MATCH(awk,TOK_LNOT))?  HAWK_UNROP_LNOT:
-	         (MATCH(awk,TOK_BNOT))?  HAWK_UNROP_BNOT: -1;
+	         (MATCH(awk,TOK_TILDE))? HAWK_UNROP_BNOT: -1; /* ~ in the unary context is a bitwise-not operator */
 
 	if (opcode <= -1) return parse_increment (awk, xloc);
 
@@ -6416,8 +6415,7 @@ static int get_symbols (hawk_t* awk, hawk_ooci_t c, hawk_tok_t* tok)
 		{ HAWK_T("%%"),  2, TOK_CONCAT,       0 },
 		{ HAWK_T("%="),  2, TOK_MOD_ASSN,     0 },
 		{ HAWK_T("%"),   1, TOK_MOD,          0 },
-		{ HAWK_T("~~"),  2, TOK_BNOT,         0 },
-		{ HAWK_T("~"),   1, TOK_MA,           0 },
+		{ HAWK_T("~"),   1, TOK_TILDE,        0 },
 		{ HAWK_T("("),   1, TOK_LPAREN,       0 },
 		{ HAWK_T(")"),   1, TOK_RPAREN,       0 },
 		{ HAWK_T("{"),   1, TOK_LBRACE,       0 },
diff --git a/hawk/lib/tree.c b/hawk/lib/tree.c
index 782a40b1..f49570bc 100644
--- a/hawk/lib/tree.c
+++ b/hawk/lib/tree.c
@@ -85,8 +85,7 @@ static const hawk_ooch_t* unrop_str[] =
 	HAWK_T("+"),
 	HAWK_T("-"),
 	HAWK_T("!"),
-	HAWK_T("~~"),
-	HAWK_T("`")
+	HAWK_T("~")
 };
 
 static const hawk_ooch_t* incop_str[] =
diff --git a/hawk/scripts/tcp-proxy.awk b/hawk/scripts/tcp-proxy.awk
index 7e7c0512..cafaf6c6 100644
--- a/hawk/scripts/tcp-proxy.awk
+++ b/hawk/scripts/tcp-proxy.awk
@@ -64,7 +64,7 @@ function handle_bridge_eof (&brtab, fd, mx)
 
 	pfd = brtab[fd];
 
-	evmask = brtab[fd,"evmask"] & ~~sys::MUX_EVT_IN;
+	evmask = brtab[fd,"evmask"] & ~sys::MUX_EVT_IN;
 	if (sys::modinmux(mx, fd, evmask) <= -1) return -1;
 	brtab[fd,"evmask"] = evmask;
 	brtab[fd,"eof"] = 1;
@@ -100,7 +100,7 @@ function bridge_traffic (&brtab, fd, mx)
 		x = sys::write(pfd, buf, pos);
 		if (x == sys::RC_EAGAIN)
 		{
-			evmask = brtab[fd,"evmask"] & ~~sys::MUX_EVT_IN;
+			evmask = brtab[fd,"evmask"] & ~sys::MUX_EVT_IN;
 			if (sys::modinmux(mx, fd, evmask) <= -1) return -1;
 			brtab[fd,"evmask"] = evmask;
 
@@ -145,7 +145,7 @@ function bridge_pendind_data (&brtab, fd, mx)
 	## sent all pending data. 
 	delete brtab[fd,"pending"];
 
-	evmask = brtab[fd,"evmask"] & ~~sys::MUX_EVT_OUT;
+	evmask = brtab[fd,"evmask"] & ~sys::MUX_EVT_OUT;
 	if (sys::modinmux(mx, fd, evmask) <= -1) return -1;
 	brtab[fd,"evmask"] = evmask;