command /h [<text>]:
    trigger:
        if arg 1 is "hide":
            send "&cAll players have been hidden."
            hide all players from player
            hide the player from all players
        if arg 1 is "show":
            send "&aAll players are displayed."
            reveal all players from player
            reveal the player from all players
        if arg 1 is not set:
            send "&9How to Use: &7/h <hide/show>"