Mercurial > repos > devteam > show_beginning

diff headWrapper.pl @ 0:ecca14446e6a
Uploaded show_beginning tarball.
author: devteam
date: Tue, 04 Dec 2012 11:05:17 -0500
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/headWrapper.pl	Tue Dec 04 11:05:17 2012 -0500
@@ -0,0 +1,19 @@
+#! /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;
+