Misc

beep	Outputs the bell-character, usually causing your terminal to beep.
cat	Displays the contents of the specified file in the active window if -window is specified, otherwise to the closest matching window depending on levels. …
cd	Changes the current active directory.
echo	Displays the given text.
eval	Evaluates the given commands and executes them; you can use internal variables and separate multiple commands by using the ; character. If the command contains a string with $, \ or ; those characters need to be escaped: …
exec	Executes the specified command in the background; the process can be accessed by its id or the name you gave it. …
help	Displays the documentation for the given command.
load	Loads a plugin; if the full path isn’t given, it will attempt to load from common directories in your installation path. …
unload	Removes a module from the memory.
uptime	Displays how long Irssi has been running.
version	Displays the version and compatibility parameters of the given server, or for the server the target nickname is on.