Value(s) are not set, but pushed into array @opt_name. $ perl cli.pl $ perl cli.pl --logfile logging to STDERR $ perl cli.pl --logfile data.log logging to file data.log The extra nice part is that because GetOptions allow the user to shorten the name of the options even this will work: $ perl cli.pl $ perl cli.pl --log logging to STDERR Where we supplied --log instead of --logfile. Perl comes with two modules that handle command line options: Getopt::Std and Getopt::Long. It adheres to the POSIX syntax for command line options, with GNU extensions. It parses the command line from @ARGV, recognizing and removing specified options and their possible values. This was the first Perl module that provided support for handling the new style of command line options, in particular long option names, hence the Perl5 name Getopt::Long. Each option description consists of two elements: Option specifier. Module Getopt::Std provides two subroutines, getopt and getopts . This module also supports single-character options and bundling. Option linkage. This function adheres to the POSIX syntax for command line options, with GNU extensions. In this case, the options are restricted to alphabetic characters only, and the characters ? Luckily, you already have a great module right in front of you for handling options given on the command line: Getopt::Long, which is a core module included as standard with Perl. The Getopt::Long module implements an extended getopt function called GetOptions(). In general, this means that options have long names instead of single letters, and are introduced with a double dash ``--''. Returns 0 if errors are detected. The Getopt::Long module implements an extended getopt function called GetOptions(). These routines have in common that they use a single dash to identify option letters and they stop processing options when the first non-option is detected. In fact, the Perl 5 version of newgetopt.pl is just a wrapper around the module. Getopt::Long::GetOptions() is the successor of newgetopt.pl that came with Perl 4. If an ``@'' sign is appended to the argument specifier, the option is treated as an array. After GetOptions has processed the options, @ARGV contains only command-line arguments that were not options. Since the shell expands the wildcard prior to perl, double-quoting "*.dbg" will resolves this, but sometimes the users don't always use double-quotes. Defines the option name and optionally a value as an argument specifier. and - . Getopt::Std provides two subroutines, getopt() and getopts() . This function retrieves and processes the command-line options with which your Perl program was invoked, based on the description of valid options that you provide. GetoptLong package also provides some adaptations for easier use in R. Using Getopt:Long ... Is there a way to correctly capture all the files return if the cmd line arg contains a wildcard? This lets you use the standard double-dash style of option names: myscript --source-directory "/var/log/httpd" --verbose \ --username=JJ Using Getopt::Long It is fully upward compatible. The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. e.g., -f *.dbg? There are already several R packages which parse command-line arguments such as getopt, optparse, argparse, docopt.Here GetoptLong is another command-line argument parser (actually it was developed very early, the first CRAN version was in 2013) which wraps the powerful Perl module Getopt::Long. Perl comes standard with two modules that assist programs in handling command line options: Getopt::Std and Getopt::Long. This was the first Perl module that provided support for handling the new style of command line options, hence the name Getopt::Long. 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