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#!/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;
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