My mistake. For some reason I couldn't use it through FRT's SM console or in game with a permission level of 0. I just figured out I can use the command in PuTTY. I think the server could use a restart.
Is there a command that displays players' entityIDs without also displaying sensitive information, such as coords? I want to give everyone the ability to use "pm" and "re", but some player have spaces or weird characters in their name. It would help if they could use the player's entityID instead of their name. If I give them the ability to use "lp" or "le", it would also be giving them the ability to see everyone's coords.