command /checkpoint [<text>]:
    trigger:
        if arg 1 is not set:
            set {checkpoint} to location of player
            send "&eUstawiles checkpoint."
            stop
        if arg 1 is "usun":
            delete {checkpoint}
            send "&eUsunales checkpoint."
            stop
        else:
            send "&cPoprawne uzycie: &f/checkpoint usun"
            stop