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File Name : parsetime.pl

#!/usr/bin/perl

# This is a (working) example of how to write a helper routine for
# Getopt::Long to deal with specific cases.
#
# The basic principle is:
#   - specify the option type to be string
#   - specify a code reference to handle the parsing an assignment.
#
# This example parses time specifications in the form HH:MM:SS.mmm, where
# unneeded parts may be left out.

use strict;
use warnings;
use Getopt::Long;

# The helper routine. It will be called to handle the actual delivery
# of the option value.
# There are two parameters: the option name, and the value to be
# assigned.
# Note the use of 'die' to signal errors back to Getopt::Long.

sub parsetime {
    my ($opt_name, $opt_value) = @_;
    my $val = 0;
    unless ( $opt_value =~ /
	^		# beginning of value string
	(?:(\d+):)?	# hours
	(?:(\d+):)?	# minutes
	(\d+(?:\.\d+)?)	# seconds + fraction
	$		# end of value string
	/x ) {
	die("Value \"$opt_value\" invalid for option $opt_name\n");
    }

# Return the value.
    ( defined $1 ? 3600*$1 : 0) +
    ( defined $2 ?   60*$2 : 0) +
    $3;
}

@ARGV = ("-time", "1:24.14") unless @ARGV;

my $time;
GetOptions("time=s" => sub { $time = &parsetime }) &&
  print "time = $time seconds\n";

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2018-05-10 04:21:54
..	dir	-	root/root	drwxr-xr-x	2018-05-10 04:21:54
README	file	322 B	root/root	-rw-r--r--	2006-07-23 02:34:06
parsetime.pl	file	1.19 KB	root/root	-rw-r--r--	2004-10-08 11:40:22
skel1.pl	file	1.97 KB	root/root	-rw-r--r--	2011-04-19 07:07:03
skel2.pl	file	2.46 KB	root/root	-rw-r--r--	2011-09-04 06:08:49
skel3.pl	file	2.52 KB	root/root	-rw-r--r--	2010-07-09 12:30:13
skel4.pl	file	2.89 KB	root/root	-rw-r--r--	2010-07-09 12:31:06