Added in 1.5

/debug [-acdgNeinpstrNoNUN] [N] [on | off | @window | filename] [identifier]

Outputs raw server messages, both incoming and outgoing to a file or a custom window.

If a custom window is defined, and it doesn't exist, a window will be created.

If no filename or custom window is defined, default filename of "debug.log" will be used.

/debug works per server.

Switches

-c - Closes the associated custom window. (used with off)
-dN - Enable Editbox; 0 = single, 1 = multi, 2 = auto, 3 = default. (AdiIRC only)
-e - Adds extended debug information. (AdiIRC only)
-i - Calls the specified identifier before a debug line is logged. The return value of the identifier is used as the debug line.
-n - Minimizes the custom window, if a new one is created.
-p - TODO
-t - Adds timestamp to the debug line.
-s - Open a window for debugging scripts. (AdiIRC only)
-a - Only show the result when debugging scripts. (AdiIRC only)
-g - Ignore scripts running in timers when debugging scripts. (AdiIRC only)
-rN - Uses the N color index as the line color for received debug lines.
-oN - Uses the N color index as the line color for outbound debug lines.
-UN - If N = 1, enables UTF8 encoding of the output, if N = 2, disables UTF8 encoding, otherwise uses the default. (AdiIRC only)

Parameters

[N] - Line color to use in the custom window.
[on | off] - Turns debugging on or off.
[@window | filename] - Custom window or filename to log to.
[identifier] - Identifier to parse a line, used with -i.

Example

; Turns on debug to custom window named '@debug' and minimizes it.
/debug -n @debug

; Turns off debug and closes the custom window
/debug -c off

; Turns on debug to file named 'debug.log' and enables timestamp.
/debug -t debug.log