Re: Perl Syntax -- SOLVED
From: Drew Tomlinson (drew_at_mykitchentable.net)
Date: 06/30/04
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Date: Wed, 30 Jun 2004 10:51:04 -0700 To: Matthew Seaman <m.seaman@infracaninophile.co.uk>
On 6/30/2004 10:34 AM Matthew Seaman wrote:
>On Wed, Jun 30, 2004 at 10:17:45AM -0700, Drew Tomlinson wrote:
>
>
>>On 6/30/2004 10:04 AM Steve Bertrand wrote:
>>
>>
>
>
>
>>>I know this works:
>>>
>>>if ($ARGV[0] eq '') {
>>> print "Debug Mode\n";
>>>}
>>>
>>>
>
>
>
>>Thanks for your reply. I tried your suggestion and it seems to work but
>>I get this output:
>>
>>Use of uninitialized value in string eq at ./test.pl line 16.
>>You must include the file name.
>>
>>
>
>Unless you supply at least one argument to the script, $ARGV[0] won't
>exist. There's a difference in perl between 'not defined' and an
>empty string (or zero for numerical values). Try:
>
> if ( @ARGV < 1 ) {
> usage();
> exit 1;
> }
>
>or
>
> unless ( defined $ARGV[0] ) {
> usage();
> exit 1;
> }
>
>
Thank you very much for the explanation. Now I understand why I was
getting the error message. I didn't quite understand how to use
"usage();" but replaced it with a print statement. It works perfectly!
Thanks,
Drew
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