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Full Discussion: Getopt Help
Top Forums Shell Programming and Scripting Getopt Help Post 303015612 by mutley2202 on Sunday 8th of April 2018 02:50:38 PM
Old 04-08-2018
Getopt Help
Hi All,

An old work friend wrote a script which I've been trying to understand how a section of it currently works and work out how i can add some command line switches which i can use later in the script to append the output depending on the command line arguements.

Currently it works by triggering is as per the below

Code:
./data_parser.pl -f testinputfile.txt

Code:
use strict;
use Getopt::Std;
use constant DEBUG => 0;

$| = 1;
my $current_colour = '36';

my %opt = ('f' => '-');

getopts("f:", \%opt);
my $opentag = $opt{'f'};
if ($opt{'f'} eq '-') {
        ;
} elsif (-f $opt{'f'}) {
        if ($opt{'f'} =~ /\.gz$/) {
                $opentag = 'gunzip -c '.$opt{'f'}.'|';
        }
} else {
        die "File ", $opt{'f'}, " not found\n";
}
open (FH, $opentag);

I dont understand what the getopts parts are doing, would someone be kind enough to shed some light and point me in the right direction with how i can add some switches on command execution.

Thanks in advance.
 

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LEARN ABOUT MOJAVE

moosex::getopt::gld

MooseX::Getopt::GLD(3pm)				User Contributed Perl Documentation				  MooseX::Getopt::GLD(3pm)

NAME

       MooseX::Getopt::GLD - A Moose role for processing command line options with Getopt::Long::Descriptive

VERSION

       version 0.59

SYNOPSIS

	 ## In your class
	 package My::App;
	 use Moose;

	 with 'MooseX::Getopt::GLD';

	 # or

	 with 'MooseX::Getopt::GLD' => { getopt_conf => [ 'pass_through', ... ] };

	 has 'out' => (is => 'rw', isa => 'Str', required => 1);
	 has 'in'  => (is => 'rw', isa => 'Str', required => 1);

	 # ... rest of the class here

	 ## in your script
	 #!/usr/bin/perl

	 use My::App;

	 my $app = My::App->new_with_options();
	 # ... rest of the script here

	 ## on the command line
	 % perl my_app_script.pl -in file.input -out file.dump

OPTIONS

       This role is a parameterized role. It accepts one configuration parameter, "getopt_conf". This parameter is an ArrayRef of strings, which
       are Getopt::Long configuration options (see "Configuring Getopt::Long" in Getopt::Long)

AUTHOR

       Stevan Little <stevan@iinteractive.com>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2007 by Infinity Interactive, Inc.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.18.2							    2013-11-30						  MooseX::Getopt::GLD(3pm)
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