Perldoc Browser is maintained by Dan Book ().Please contact him via the GitHub issue tracker or email regarding any issues with the site itself, search, or rendering of documentation.. Using Getopt:Long ... Is there a way to correctly capture all the files return if the cmd line arg contains a wildcard? 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. GetoptLong package also provides some adaptations for easier use in R. In fact, the Perl 5 version of newgetopt.pl is just a wrapper around the module. 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. Each option description consists of two elements: Option specifier. $ 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. The Getopt::Long module implements an extended getopt function called GetOptions(). After GetOptions has processed the options, @ARGV contains only command-line arguments that were not options. 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. This function adheres to the POSIX syntax for command line options, with GNU extensions. Getopt::Std provides two subroutines, getopt() and getopts() . and - . 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. Option linkage. The Getopt::Long module implements an extended getopt function called GetOptions(). The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. Returns 0 if errors are detected. It is fully upward compatible. This was the first Perl module that provided support for handling the new style of command line options, hence the name Getopt::Long. 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. Module Getopt::Std provides two subroutines, getopt and getopts . It adheres to the POSIX syntax for command line options, with GNU extensions. The Getopt::Long module implements an extended function called GetOptions(). If an ``@'' sign is appended to the argument specifier, the option is treated as an array. In this case, the options are restricted to alphabetic characters only, and the characters ? It parses the command line from @ARGV, recognizing and removing specified options and their possible values. Value(s) are not set, but pushed into array @opt_name. This lets you use the standard double-dash style of option names: myscript --source-directory "/var/log/httpd" --verbose \ --username=JJ Using Getopt::Long Getopt::Long::GetOptions() is the successor of newgetopt.pl that came with Perl 4. 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. Each expects a single dash before option letters and stops processing options when the first non-option is detected. 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