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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. This was the first Perl module that provided support for handling the new style of command line options, hence the name Getopt::Long. It parses the command line from @ARGV, recognizing and removing specified options and their possible values. 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 adheres to the POSIX syntax for command line options, with GNU extensions. $ 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. 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. In general, this means that options have long names instead of single letters, and are introduced with a double dash ``--''. Module 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. The Getopt::Long module implements an extended getopt function called GetOptions(). Getopt::Long::GetOptions() is the successor of newgetopt.pl that came with Perl 4. In this case, the options are restricted to alphabetic characters only, and the characters ? If an ``@'' sign is appended to the argument specifier, the option is treated as an array. 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. Each expects a single dash before option letters and stops processing options when the first non-option is detected. It is fully upward compatible. e.g., -f *.dbg? The Getopt::Long module implements an extended getopt function called GetOptions(). Value(s) are not set, but pushed into array @opt_name. GetoptLong package also provides some adaptations for easier use in R. The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. 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. 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. Returns 0 if errors are detected. Getopt::Std provides two subroutines, getopt() and getopts() . Perl comes with two modules that handle command line options: Getopt::Std and Getopt::Long. Perl comes standard with two modules that assist programs in handling command line options: Getopt::Std and Getopt::Long. Using Getopt:Long ... Is there a way to correctly capture all the files return if the cmd line arg contains a wildcard? and - . In fact, the Perl 5 version of newgetopt.pl is just a wrapper around the module. After GetOptions has processed the options, @ARGV contains only command-line arguments that were not options. Defines the option name and optionally a value as an argument specifier. Each option description consists of two elements: Option specifier. Option linkage. 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