while (<SERVER_LIST>) {
    next if /$ignore/ ;
    # chomp is safer than chop...read the perldoc for 
    # both of those functions (perldoc -f chop for chop
    chomp; 
    my ($folder, $server_name, $session_name, $protocol)= split (":");
    my ($hexport,$version,$compr)=create_port($protocol);
    my $user=create_user($folder);
    # the &sub syntax is not advised in most situations for reasons 
    # that are slightly advanced, sub() suffices
    create_session($server_name, $session_name, $protocol, $user);
    create_link($folder, $server_name, $session_name);
}