Synopsis:
   on [<modes>]signoff [<serial#>] [-|^]<match> { <action> }

Description:
   This hook is triggered whenever the client observes another client on
   a common channel signing off from irc.  It only hooks once per user,
   not once per channel.

Parameters:
   $0    nickname of person signing off
   $1-   signoff message

See Also:
   on(5) channel_signoff, exit; quit(1)

Other Notes:
   This hook is only triggered for other users.  To hook your own signoff,
   use the EXIT hook.