Mode (OperServ Command)
This command is used for changing channel modes in channels. This command accepts 2 or 3 arguments, the target channel, either the modes to be changed or the word clear, and optionally the word all if the word clear is used as the second argument. Thus, if you wish to set modes +si on #channel and remove modes lR, you could use the following command:
/msg OperServ mode #channel +si-lR
If you use the word clear, then all channel modes are cleared. User status is left untouched in every case if no third argument is passed to the command. If you specify clear all however, then all channel modes are removed and all user statuses on channels, such as voices and operators, are also removed.