programming-examples/perl/Hash/The keys operator returns a list of all the key names within a hash.pl

#!/usr/bin/perl -w

# Associative array or hash keys.
$hash{"Name"} = "G ";
$hash{"Address"} = "1 Penn.";
$hash{"City"} = "W";

@key_names = keys(%hash);

print "Key names are: @key_names\n\n";

# Now, access each element from the list.
foreach $key (@key_names) {
     print "$key holds $hash{$key}\n";
}