# File lib/rbot/auth.rb, line 125
    def usermod( username, item, value=nil )
      if @users.has_key?( username )
        case item
          when 'hostmask'
            if Irc.ismask?( value )
              @users[username].hostmasks = [ value ]
              return true
            end
          when '+hostmask'
            if Irc.ismask?( value )
              @users[username].hostmasks += [ value ]
              return true
            end
          when '-hostmask'
            if Irc.ismask?( value )
              @users[username].hostmasks -= [ value ]
              return true
            end
          when 'password'
              @users[username].password = value
              return true
          when 'level'
              @users[username].level = value.to_i
              return true
          else
            debug "usermod: Tried to modify unknown item #{item}"
            # @bot.say tell, "Unknown item #{item}" if tell
        end
      end
      return false
    end