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Perl Program listing files in a directory

Posted on 2008-06-21
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Last Modified: 2008-07-12
I'm a beginner at creating perl programs.  How can I create a program that will list files in a directory and provide a user with 3 command line options.  They should be able to specify a directory, which I think you use the -d option, also they can display a long listing of the files, I think you use the -l and allow them select no options.  Also, when the files are listed they should be sorted by the filename.  I'm new to creating perl programs, not sure how to accomplish this.
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Question by:cntech
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by:Tintin
ID: 21838489
Your specification is unclear.

You say there should be three command line options, but you have listed just 2.  What behaviour do you want when no options are selected?
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by:agriesser
ID: 21838543
There are several implementations of such a program at the following link:

http://www.nntp.perl.org/group/perl.beginners/2007/06/msg92313.html
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by:agriesser
ID: 21838552
I'll include the program here just in case the other site isn't reachable sometime in the future.

Please note: The code is (c) John W. Krahn.
#!/usr/bin/perl

use warnings;

use strict;

use Getopt::Std;
 

getopt 'hl', \my %opt;
 

exists $opt{ h } && die <<HELP;

usage: $0 [-h] [-l] [directory]

      -h    this message

      -l    long listing

HELP
 

my $dir    = shift || '.';

my $format = "%-25s %10s %-8s %-8s\n";
 

opendir my $dh, $dir or die "Cannot open '$dir' $!";
 

if ( exists $opt{ l } ) {

     printf $format, 'File Name', 'Size', 'Owner', 'Group'

     }

else {

     print "File Name\n"

     }
 

while ( my $file = readdir $dh ) {

     my ( $uid, $gid, $size ) = ( lstat "$dir/$file" )[ 4, 5, 7 ] or die 

"Cannot stat '$dir' $!";

     next unless -f _;

     if ( exists $opt{ l } ) {

         printf $format, $file, $size, scalar getpwuid $uid, scalar 

getgrgid $gid

         }

     else {

         print "$file\n"

         }

     }

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ID: 21924183
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