Date: Wed, 30 Jun 2004 10:17:45 -0700 From: Drew Tomlinson <drew@mykitchentable.net> To: Steve Bertrand <steveb@eagle.ca> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: Perl Syntax Message-ID: <40E2F5B9.305@mykitchentable.net> In-Reply-To: <4769.209.167.16.15.1088615085.squirrel@209.167.16.15> References: <40E2EF7E.3000901@mykitchentable.net> <4769.209.167.16.15.1088615085.squirrel@209.167.16.15>
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On 6/30/2004 10:04 AM Steve Bertrand wrote:
>>I'm using perl 5.8.4 on a 4.9 machine. I want to add code a perl script
>>to check for value passed from command line. If it is null, I want to
>>exit with an error message.
>>
>>First I tried this and got "Use of uninitialized value in string eq at
>>./test.pl line 20."
>>
>>if ($ARGV[0] eq "") {
>> print "You must include the file name.";
>> exit 1;
>>}
>>
>>Next I tried this but get "Use of uninitialized value in length at
>>./test.pl line 20."
>>
>>if (length ($ARGV[0]) = "0") {
>> print "You must include the file name.";
>> exit 1;
>>}
>>
>>I've searched the web and all examples that I've found indicate that I'm
>>doing things correctly but obviously I'm not. What am I doing wrong?
>>
>>
>>
>
>I know this works:
>
>if ($ARGV[0] eq '') {
> print "Debug Mode\n";
>}
>
>Cheers,
>
>Steve
>
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.
I have "use warnings;" and "use strict;" in the script. I assume the
error comes from the "use warnings;" but why does perl see "eq" as a
string and not an operator? Or am I misinterpreting the message?
Thanks,
Drew
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