Using Getopt::EvaP to parse command-line arguments

[munkyeetr]

I'm new to PERL, and am trying to use the Getopt::EvaP module to parse my command-line arguments, but I am a little lost as to how to make this work.

So far I have downloaded and installed the module, and added the following to my script:

use Getopt::EvaP;

Now, I'm not sure where I add the PDT syntax; does this go in my script, or is it an external file? So there's PDT, MM, and OPT that I need to specify to make this work.

Could someone please post a very basic working example of using this module, so that I can get a handle on how I can make it work in my script?

Any help would be very appreciated.

[miller]

The only advice that I have to give is to not use Getopt::EvaP. The most standard module that I know to use is Getopt::Long. The other module hasn't been updated since 1999.

cpan Getopt::Long

There are plenty of examples and documentation provided in that module.

- Miller

[munkyeetr]

Thank you. I'll try with that when I get home.

[numberwhun]

Also, in the spirit of TMTOWTDI:

Keep in mind that you command line arguments are automatically plugged into the special array @ARGV.

So, if you are just wanting someone to supply a file name, then you can get that file name into a variable by using:

$varName = "@ARGV[0]";

In addition, you can check to see if @ARGV has the required number of elements. Lets say that you have a requirement that 4 parameters must be specified to the script, then you could use the following to check that:

if ($#ARGV != 4)
{
print usage statement;
}

The $#ARGV contains the number of elements in @ARGV. After than, you could test each argument for what might be expected or just move on to the next step, its up to you.

Hope this helps.

Regards,

jlk

[KevinADC]

$#ARGV would be the index number of the last element of @ARGV, which is one less than the length of the array. So for four arguments:

if ($#ARGV != 3) {
    error message
}

[numberwhun]

$#ARGV would be the index number of the last element of @ARGV, which is one less than the length of the array. So for four arguments:

if ($#ARGV != 3) {
    error message
}

DOH!!! You are correct. I swear I have to start running things under your scanner to see if I mis-spoke before hitting "Submit Reply". :-)

jlk

[munkyeetr]

Thank you, everyone, for your replies...

I changed to Getopt::Long and all is rosey again. Good documentation and excellent results. It's a handy module.

[miller]

Excellent.

Glad that we could help.

- Miller