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Perl: the Markov chain saw

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#!/usr/bin/perl # Stephen Flitman - extract one or more columns of a table # Released under GPLv2 # Usage: ... | xcol N M ... # where N, M, ... are 0-based column indices, and columsn are split by + tabs # if invoked without arguments, tells you what columns are present and + their indices, useful if there is a header row use strict; if (@ARGV) { while (<STDIN>) { chop; my @fields=split(/\t/,$_); for (my $i=0; $i<=$#ARGV; $i++) { print $fields[$ARGV[$i]]; print "\t" if $i<$#ARGV; } print "\n"; } } else { my $line; until ($line=~/\t/) { $line=<STDIN>; } chop $line; die "No lines to process" unless $line; my $i=0; for my $field (split(/\t/,$line)) { printf "%3d: $field\n",$i++; } } exit;

In reply to xcol by sflitman

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