diff --git a/README.md b/README.md
index 06ed970..8df859e 100644
--- a/README.md
+++ b/README.md
@@ -82,8 +82,8 @@ I spawn Acme by running `a` script.
 Who is who in **bin** directory:
 
 - `a` start Acme
-- `c+ SYMBOL` add comment (python: `|c+` or `|c+ '#'`, erlang: `|c+ %`, js: `|c+ //`)
-- `c- SYMBOL` delete comment (python/erlang: `|c-`, js: `|c- //`)
+- `c+ SYMBOL` comment selection (python: `|c+` or `|c+ '#'`, erlang: `|c+ %`, js: `|c+ //`)
+- `c- SYMBOL` uncomment selection
 - `g+ WHAT` recursively grep current directory
 - `git+ MESSAGE` git: commit and push to master
 - `h+` heading
diff --git a/bin/c+ b/bin/c+
index c4d78a3..517fbc0 100755
--- a/bin/c+
+++ b/bin/c+
@@ -1,10 +1,9 @@
-#!/usr/bin/env perl
+#!/usr/bin/env bash
 
-my ($symbol) = @ARGV;
+symbol="$1"
 
-# default: | c+ '#'
-$symbol = '#' unless $symbol;
+if [ ! "$symbol" ]; then
+	symbol='#'
+fi
 
-while (<STDIN>) {
-	print "$symbol$_";
-}
+sed "s!^!$symbol!"
diff --git a/bin/c- b/bin/c-
index 58a423d..e3ca2d3 100755
--- a/bin/c-
+++ b/bin/c-
@@ -1,12 +1,9 @@
-#!/usr/bin/env perl
+#!/usr/bin/env bash
 
-# default: 1 symbol comment: #, %
-# need ARGV for comments like this: //
+symbol="$1"
 
-my ($symbol) = @ARGV;
+if [ ! "$symbol" ]; then
+	symbol='#'
+fi
 
-my $offset = $symbol ? length $symbol : 1;
-
-while (<STDIN>) {
-	print substr $_, $offset;
-}
+sed "s!^\($symbol\)*!!"