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32.28. Getopt::Std
use Getopt::Std;
You can use getopt and getopts with globals:
our ($opt_o, $opt_i, $opt_f);
getopt('oif');# -o, -i, and -f all take arguments.
# Sets global $opt_* variables.
getopts('oif:'); # Now -o & -i are boolean; -f takes an arg.
# Still sets global $opt_* as side effect.
Or you can use them with a private options hash:
my %opts;# We'll place results here.
getopt('oif', \%opts);# All three still take arguments.
getopts('oif:', \%opts);# Now -o and -i are boolean flags
# and only -f takes an argument.
The Getopt::Std module provides two functions, getopt and
getopts, to help you parse command-line arguments for single-character
options. Of the two, getopts is the more useful because it
lets you specify that some options take arguments and others don't,
whereas getopt assumes all options take arguments. By specifying
to getopts a letter with a colon after it, you indicate that
that argument takes an argument; otherwise, a Boolean flag is
expected. Standard option clustering is supported. Ordering doesn't
matter, so options taking no arguments may be grouped together.
Options that do take an argument must be the last in a group or by
themselves, and their argument may either come immediately after the
option in the same string, or else as the next program argument.
Given the example getopts use above, these are equivalent
calls:
% prog -o -i -f TMPFILE more args here
% prog -o -if TMPFILE more args here
% prog -io -fTMPFILE more args here
% prog -iofTMPFILE more args here
% prog -oifTMPFILE more args here