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        }
    }

    return uniq @apps;
}

sub config_help {
    my $message = shift || q{};
    print <<"HELP";
$message

munner.yml config template:
---------------------------
base_dir: "... base directory to find the app ..."
apps:
    web-frontend:
        dir: "... either full path or the tail part after base_dir ..."
        env:
            ## specify the username of the running process
            - USER: web
            - PID_FILE: /tmp/web.pid
            - ACCESS_LOG: /var/log/web.acc.log
            - ERROR_LOG: /var/log/web.err.log
        run: "... command ..."
        carton: 1 or 0
    db-api:
        dir: "... path cound find the command to run ..."
        env:
            - USER: db
            ## Having your own pid file and access and error log path
            - PID_FILE: /tmp/db.pid
            - ACCESS_LOG: /var/log/db.acc.log
            - ERROR_LOG: /var/log/db.err.log
            - foo: 1
            - bar: 2
        leash: "make sure all the child processes stopped"
        run: "... start up command ..."
    event-api:
        dir: "websrc/event-api"
        env:
            - USER: event
            ## access and error log will be stored at app dir
            ## specific your pid file path
            - PID_FILE: /var/log/event.pid
            - CHILD_PROCESS_LEASH: "make sure no abandoned children procresses"
        run: bin/app.pl
        carton: 1
    login-server:
        ## Use abs path as app base path
        dir: /home/gateway/websrc/login-server
        env:
            - USER: gateway
              ## Using LOG_DIR for pid file, access log and error log
            - LOG_DIR: /var/log
        run: bin/app.pl
        carton: 1
    ssh-port-forward:
        dir: /tmp
        env:
            - USER: me
            ## Using TERMINAL to let ssh stay alive in the background
            - TERMINAL: 1
        timeout: 5
        run: ssh -L 3306:localhost:3306 db-server
groups:
    database:
        ## only start these apps
        apps:
            - login-server
            - db-api
    events:
        apps:
            - login-server
            - event-api
    website:
        ## start apps and above groups
        apps:
            - web-frontend
        groups:
            - database
            - events
    initd:
        ## add startup script in /etc/init.d folder
        ## to run "munner duck -g initd"
        groups:
            - website
            - database
            - events

HELP

    exit;
}