CODEWITHSUNDEEP
perlcommand-line
Joel G Mathew
Joel G Mathew

Reputation: 8061

How to pass multiple parameters for the same commandline argument?

Scenario: I need to pass names of multiple tv shows to a script: Eg. ./script -a "Homeworld" -a "Supernatural"

I'm using Getopt::Long::Configure to get the options.

sub ArgParser
{
    my ($help,$addshow,$delshow,$checkshow,$listshows) = ();
    GetOptions ('help|h' => \$help,             
                'add|a=s' => \$addshow,             
                );
    if ($help)
    {
        HelpPrint;      
    }
    elsif ($addshow)
    {
        say $addshow;       
    }   
    else 
    {        
        HelpPrint("Invalid option or no options specified!");
    }
    exit;
}

ArgParser;

Currently, only the last specified argument is being received by the script. How can I detect whether multiple parameters to the same argument are being passed on the command line?

@ARGV does contain all arguments, so how can I use them?

Upvotes: 1

Views: 13461

Answers (1)

carlosn
carlosn

Reputation: 433

You could just pass the argument with a separator:

Options with multiple values

Often it is useful to allow comma-separated lists of values as well as multiple occurrences of the options. This is easy using Perl's split() and join() operators:

    GetOptions ("library=s" => \@libfiles);
    @libfiles = split(/,/,join(',',@libfiles));

Or another option is:

    --library lib/stdlib --library lib/extlib

To accomplish this behaviour, simply specify an array reference as the destination for the option:

    GetOptions ("library=s" => \@libfiles);

Using the first example, your command line would be:

./script -a "Homeworld" -a "Supernatural" -a "Breaking Bad"
   -or-
./script -a "Homeworld,Supernatural,Breaking Bad"
   -or-
./script -a "Homeworld,Supernatural" -a "Breaking Bad"

Using the second example, your command line would be:

./script -a "Homeworld" -a "Supernatural" -a "Expanse, The"

Upvotes: 6

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