Perl Syntax

[Drew Tomlinson]

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?

Thanks,
Drew
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