Added in 2.3
/log <on|off> <window> [-f filename]
Turns on/off logging for a window to a specific file.
Parameters
<on|off> - Turns logging on or off.
<window> - Window to turn logging on or off for.
[-f filename] - Filename to log to. (optional)
Example
; Enable logging for channel '#adiirc' to specific log file 'Logs\#adiiirc.log'. /log on #adiirc -f Logs\#adiirc.log