John Ambers John Ambers - 1 year ago 76
Perl Question

Use of uninitialized value error in perl cgi

I am getting the following error when I try to execute my CGI script from the terminal:

Use of uninitialized value $friends{"Bob=416-333-6363"} in print at ./new-cgi/data.cgi line 24

Here is my script:

#!/usr/bin/perl -w

use strict;

my %friends;
my $name;
my $phone;

open FILE, "new-cgi/data.dat" or die ("No File\n");

while (<FILE>) {


($name, $phone) = split(" ", $_);



foreach (keys %friends) {

print "Name:", $_, "\n";
print "Phone:", $friends{$_}, "\n"; <--This is line 24

Answer Source

Hard to see without seeing your new-cgi/data.dat file, but I assume that the data format is a bunch of lines like "Bob=416-333-6363" in which case you want to split on /=/ not " ".

What's happening now is that you're splitting on a non-existant whitespace so $name (the eventual key) gets the entire line and $phone the eventual value, gets an undef value. So when you iterate over the hash later, you have a hash with lots of keys (albeit with odd data for the keys) and undef values.

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