elsif-diff

# OLD:
# if we need to run a command that doesn't require fully parsing the config file, do it now (and exit)
if (!defined($cmd) or ((!$cmd) && ('0' ne $cmd))) {
    show_usage();
}
elsif ($cmd eq 'help') {
    show_help();
}
elsif ($cmd eq 'version') {
    show_version();
}
elsif ($cmd eq 'version-only') {
    show_version_only();
}
elsif ($cmd eq 'check-config-version') {
    check_config_version();
}
elsif ($cmd eq 'upgrade-config-file') {
    upgrade_config_file();
}

# NEW:
# if we need to run a command that doesn't require fully parsing the config file, do it now (and exit)
for ($cmd) {
    show_usage()           if !defined($_) or ((!$_) && ('0' ne $_));
    show_help()            if /help/;
    show_version()         if /version/;
    show_version_only()    if /version-only/;
    check_config_version() if /check-config-version/;
    upgrade_config_file()  if /upgrade-config-file/;
}