I am trying to use a function in my script. I'm not quite sure how to complete it. This is my assignment:
The first version of hw12.sh should display the usage message "usage: $0 argument", "Enter one or more arguments." when no arguments are on the command line.
$ hw12.sh
usage: hw12.sh argument
Enter one or more arguments.
- The second version of hw12.sh should display the message "There were $# arguments on the command line" if there were 1 or more arguments on the command line. Here is an example.
$ hw12.sh abc 123
There were 2 arguments on the command line.
- The final version of hw12.sh has the following change. Display the usage message from a function. Here is an example.
$ hw12.sh hello hw12.sh
There were 2 arguments on the command line.
$ hw12.sh
usage: hw12.sh argument
Enter one or more arguments.
This is my code that wrote but it says i have a syntax error any help would be appreciated. Thank you
Last edited by Scrutinizer; 11-15-2012 at 01:57 AM..
Reason: code tags
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Discussion started by: meister29
4 Replies
LEARN ABOUT OSX
getopt::long::descriptive::usage
Getopt::Long::Descriptive::Usage(3) User Contributed Perl Documentation Getopt::Long::Descriptive::Usage(3)NAME
Getopt::Long::Descriptive::Usage - the usage description for GLD
VERSION
version 0.092
SYNOPSIS
use Getopt::Long::Descriptive;
my ($opt, $usage) = describe_options( ... );
$usage->text; # complete usage message
$usage->die; # die with usage message
DESCRIPTION
This document only describes the methods of the Usage object. For information on how to use Getopt::Long::Descriptive, consult its
documentation.
METHODS
new
my $usage = Getopt::Long::Descriptive::Usage->new(\%arg);
You really don't need to call this. GLD will do it for you.
Valid arguments are:
options - an arrayref of options
leader_text - the text that leads the usage; this may go away!
text
This returns the full text of the usage message.
leader_text
This returns the text that comes at the beginning of the usage message.
option_text
This returns the text describing the available options.
warn
This warns with the usage message.
die
This throws the usage message as an exception.
$usage_obj->die(\%arg);
Some arguments can be provided
pre_text - text to be prepended to the usage message
post_text - text to be appended to the usage message
The "pre_text" and "post_text" arguments are concatenated with the usage message with no line breaks, so supply this if you need them.
AUTHORS
o Hans Dieter Pearcey <hdp@cpan.org>
o Ricardo Signes <rjbs@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2005 by Hans Dieter Pearcey.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
perl v5.16.2 2012-07-31 Getopt::Long::Descriptive::Usage(3)