?? column.htm
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<html>#!/usr/bin/perl# Mark Claypool# Last significantly modified: December, 2001# This program prints out fields of an indicated column.# The columns are numbered 0, 1, 2, 3 ...require 'getopts.pl';&ParseCommandLine;$line = <STDIN>;while ($line) { $line =~ s/^\s+//; # remove initial white-space $line =~ s/\s+/ /g; # turn double-space into single space @word = split($split,$line); # columns will then be $1, $2, $3 ... $i =0; while ($i <= $#col) { print "@word[@col[$i]]\t"; $i += 1; } print "\n"; $line = <STDIN>;}exit;######################################################################## ParseCommandLine# check for the right number of command line arguments# print usage message and quit if there is an error# global variables are @colsub ParseCommandLine { # get token to split on &Getopts('t:'); if ($opt_t) { $split = $opt_t; } else { $split = '\s+'; } # get columns while ($#ARGV >= 0) { $arg = shift(@ARGV); if ($arg =~ /^(\d+)/) { push(@col, $1); } else { &usage; } } if ($#col < 0) { &usage; }} ########################################################################### usage# print a usage maessage and quitsub usage{ print STDERR "column: print fields from an indicated column\n"; print STDERR "Usage: column <flags>, where flags are:\n"; print STDERR " [-t str]\ttoken to use as a separator (default is white space)\n"; print STDERR " {# [#...]}\tcolumn(s) to print, numbered 0,1,2...\n"; exit;}?? 快捷鍵說明
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