Usage: /blockcmd [command], /unblockcmd [command]
Example: /blockcmd help

Code (Text):

1. on command:
2.     if {blockcmd::*} contains command:
3.         cancel event
4.         send "This command is blocked."
5. command /blockcmd <text>:
6.     permission: op
7.     trigger:
8.         if arg-1 is set:
9.             if {blockcmd::*} contains arg-1:
10.                 send "This command is already blocked!"
11.             else:
12.                 add arg-1 to {blockcmd::*}
13.                 send "Succesfully blocked command: /%arg-1%"
14.         else:
15.             send "Please enter a command."
16. command /unblockcmd <text>:
17.     permission: op
18.     trigger:
19.         if arg-1 is set:
20.             if {blockcmd::*} contains arg-1:
21.                 remove arg-1 from {blockcmd::*}
22.                 send "Succesfully unblocked command: /%arg-1%"
23.             send "Command is not blocked."
24.         else:
25.             send "Please enter a command."