with code tags :)

use strict; 

my %commands = (     "command1" => \&sub1, 
            "command2" => \&sub2, 
            "command3" => \&sub3, 
            "command4" => \&sub4, 
            "command5" => \&sub5, 
            "command6" => \&sub6, 
            "exit" => sub { die "Goodbye" } 
        ); 
                    
while(1){ 
    print "1. command1\n"; 
    print "2. command2\n"; 
    print "3. command3\n"; 
    print "4. command4\n"; 
    print "5. command5\n"; 
    print "6. command6\n"; 
    print "7. exit\n"; 
    print "\n\n"; 
    print "Please choose an option from the menu above: "; 
    
    chomp(my $commands = ); 
    
    if ($commands{my $string}) {
        $commands{$string}->(); 
    } else { 
        print "No such command: $string\n"; 
    } 
}
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well, I'm not sure where the rest of this is, but if I'd have to guess i'd say the chomp(my $commands = ); and the if ($commands{my $string}) are your problem. The first is a mystery. I'm guessing you wanted something like:

my $commands = <>;
chomp $commands;
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so you could get user input and then use it to grab a sub from your hash. The second just looks like you got a bit mixed up (as i often do :). You cannot use my inside functions like that. It's its own entity and would need its own line. You could set its value with a function like:

my $this = &that($thing);
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But not that way you have it. Also, you'd need to have the variable in the hash key defined before using it - like you use it in the command after the if line.

hope that helps.

-- I'm a solipsist, and so is everyone else. (think about it)