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view tools/filters/headWrapper.pl @ 0:9071e359b9a3

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author xuebing
date Fri, 09 Mar 2012 19:37:19 -0500
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#! /usr/bin/perl -w

use strict;
use warnings;

# a wrapper for head for use in galaxy
# headWrapper.pl [filename] [# lines to show] [output]

die "Check arguments" unless @ARGV == 3;
die "Line number must be an integer\n" unless $ARGV[1]=~ m/^\d+$/;

open (OUT, ">$ARGV[2]") or die "Cannot create $ARGV[2]:$!\n";
open (HEAD, "head -n $ARGV[1] $ARGV[0]|") or die "Cannot run head:$!\n";
while (<HEAD>) {
    print OUT;
}
close OUT;
close HEAD;