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#!/usr/bin/perl
=head1 NAME
and - print lines that are present in one file and another
=head1 SYNOPSIS
and file
and [file|-] [file|-] ...
=head1 DESCRIPTION
B<and> reads the specified files and prints out the lines that are common
to all files, in the order they are listed in the last file. Use "-" to
make it read a file from standard input. If only one file is specified,
B<and> 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: and [file|-] [file|-] ...\n";
}
if (@ARGV == 1) {
unshift @ARGV, "-";
}
my %seen;
foreach my $fn (@ARGV) {
open (IN, $fn) || die "and: read $fn: $!\n";
while (<IN>) {
chomp;
$seen{$_}++;
if ($seen{$_} == @ARGV) {
print "$_\n";
}
}
close IN;
}
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