Re^3: Use of uninitialized value $

... the script still does nothing.
[root@wsprod01 myperl]# ./test.pl --domain google.com --client google Usage: ./test.pl --domain companydomain.com --client company [--job-co +de 12345] [--help].
[download]

In the code shown in the OP, in the statement

GetOptions (
     'domain=s' => \$domain,
     'client=s' => \$client,
     'job-code:i' => \$job_code,
     'help' => &usage()
 ) or &usage();
[download]

the 'help' key is given the value of whatever is returned by a call to the usage() function. Problem is, this function returns nothing; rather, it calls die to print a usage message, so program execution will never get past the GetOptions() function call. Is this what you intend?

Updates:

If you want to assign the 'help' key a reference to the usage() function,
'help' => \&usage,
would be the correct expression.
Added italic emphasis in "... a call to the usage() function."

Comment on Re^3: Use of uninitialized value $_ in string Select or Download Code

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Re^4: Use of uninitialized value $_ in string by juanpablo (Novice) on Apr 06, 2014 at 09:08 UTC
Hi AnomalousMonk, Thanks for pointing it out. Yes, I admit I missed adding the backslash before the `&usage()`. The script works fine as of now but I'm still trying to improve its features and hopefully I don't get new errors. :) Thanks a lot for the help! Cheers, JP	[reply] [d/l]
Re^5: Use of uninitialized value $_ in string by AnomalousMonk (Archbishop) on Apr 06, 2014 at 19:54 UTC
... adding the backslash before the `&usage()`. I'm sure you understand this, but just in case... Just adding a backslash in front of a subroutine invocation will cause a reference to be taken to whatever the subroutine happens to return when invoked. `c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le "sub S { return uc $_[0]; } ;; my %hash = ( 'x' => \&S('foo'), 'y' => \S('bar') ); dd \%hash; " { x => \"FOO", y => \"BAR" }` [download] Of course, the correct expression for assigning a code reference to a hash key would be `'help' => \&usage,` (Also, it's better practice to invoke subroutines without the `&` sigil due to certain occasional, unexpected side-effects. So rather than `my $x = &function('argument', 'list');` it's better to write `my $x = function('argument', 'list');` instead, thus preserving use of `&` for taking code references and for those odd function invocation cases in which its use is critical. See perlsub.)	[reply] [d/l] [select]
Re^4: Use of uninitialized value $_ in string by Bloodnok (Vicar) on Apr 05, 2014 at 15:21 UTC
I suspect that is what's intended AnomalousMonk - I've yet to write/encounter a script or command that generates usage/help ... and then proceeds onwards. A user level that continues to overstate my experience :-))	[reply]
Re^5: Use of uninitialized value $_ in string by AnomalousMonk (Archbishop) on Apr 05, 2014 at 15:50 UTC
But the problem I see is not so much with what happens when the `usage()` function is called as with the initialization of the `'help'` key when the `GetOptions()` function is called. `usage()` is called during this initialization, so script execution never gets beyond the `GetOptions()` call.	[reply] [d/l] [select]
Re^6: Use of uninitialized value $_ in string by Bloodnok (Vicar) on Apr 06, 2014 at 12:17 UTC
Ah, ok, didn't spot that meaning at all - my excuse being that it was Saturday and I was girding my loins to go and watch my team. A user level that continues to overstate my experience :-))	[reply]


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Re^3: Use of uninitialized value $_ in string