This list is quite irssi irc chat specific. Seems logical, given the name of this page.
If there is an asterisk within the version, that command is most likely as universal a command as could exist.
Also, check out: https://irssi.org/documentation/startup/
Shows the current configurations list of available networks. [v1.2.0]
Connects to a network. In the above, the command connects to the EFNet network. [v1.2.0]
Shows the current user list within the given channel. [v1.2.0]
For more information, see the irssi documentation.
Join a channel. In the above, the command joins the #irssi channel. [v1.2.0]
Part or leave a channel. In the above, the command exits the #irssi channel. [v1.2.0]
/IGNORE -channels #channel * JOINS PARTS QUITS NICKS
To ignore these types of messages in IRSSI use this command. It can be formatted in various ways. For more information, go to the irssi.org documentation. [v1.2.0]
Jump to Next window. [v1.2.0]
Jump to Previous window. [v1.2.0]
/SET autolog ON
This starts autologging. It logs all channels and private messages to specified directory. [v1.2.0]
In Ubuntu 18.04, in v1.2.0, the default location is: ~/irclogs/