To turn a feature on or off. Use the exclamation point(!) : Getopt « System Functions « Perl

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Perl » System Functions » Getopt

To turn a feature on or off. Use the exclamation point(!)


      



#Getopt::Long::GetOptions('print_header!' => \$print_header); 



#This option sets up --print_header or --noprint_header to turn off the option.



#!/usr/bin/perl -w



use Getopt::Long;



Getopt::Long::GetOptions('print_header!'   => \$print_header);



if ( defined( $print_header ) ) {

    print "print_header flag set to $print_header\n";

}

Related examples in the same category

1.	Simple options
2.	GetOptions("file=s" => \$file);
3.	Generate random passwords?
4.	Extract command-line switches with Getopt::Std
5.	Perform consistent command line parsing
6.	Process complex command lines
7.	Read from a file
8.	Using Getopt to deal with command line options
9.	getopt('pMN');
10.	If the value is optional, use a colon
11.	For a text string value, use :s for an optional value or =s for a required value:
12.	Check if a file exists
13.	A double dash (--) by itself signals the end of the command-line switches.

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