1 files changed, 57 insertions, 0 deletions
diff --git a/not b/not
new file mode 100755
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--- /dev/null
+++ b/not
@@ -0,0 +1,57 @@
+#!/usr/bin/perl
+
+=head1 NAME
+
+not - print lines that are present in one file but not another
+
+=head1 SYNOPSIS
+
+not file
+
+not [file|-] [file|-] ...
+
+=head1 DESCRIPTION
+
+B<not> reads the specified files and prints out the lines that are present
+in the first but not in subsequent files. Use "-" to make it read a file
+from standard input. If only one file is specified, B<not> first reads
+standard input, and compares it with the specified file.
+
+=head1 AUTHOR
+
+Copyright 2006 by Joey Hess <joey@kitenet.net>
+
+Licensed under the GNU GPL.
+
+=cut
+
+use warnings;
+use strict;
+
+if (@ARGV == 0) {
+	die "usage: not [file|-] [file|-] ...\n";
+}
+
+if (@ARGV == 1) {
+	unshift @ARGV, "-";
+}
+
+my $first=shift;
+
+my %seen;
+foreach my $fn (@ARGV) {
+	open (IN, $fn) || die "and: read $fn: $!\n";
+	while (<IN>) {
+		chomp;
+		$seen{$_}++;
+	}
+	close IN;
+}
+
+
+open (IN, $first) || die "and: read $first: $!\n";
+while (<IN>) {
+	chomp;
+	print "$_\n" if ! $seen{$_};
+}
+close IN;