Options:

-h, --help

Show the help message and exit.

-p PORT, --port PORT

Set the port number. The default is 9007.

-i IP, --ip IP

Set the IP (Ipv4 only) address to listen to. The default is 127.0.0.1.

-t TOKENFILE, --tokenfile TOKENFILE

Set the token file. The default is ~/.localslackirc.

-c TOKENFILE, --cookiefile TOKENFILE

Set the cookie file. This is only used on slack, and is only useful if your token starts with "xoxc".

-u, --nouserlist

Don't display userlist in the IRC client.

-j, --autojoin

Automatically join all remote channels.

-o, --override

Allow listening on addresses that do not start with 127.*
This is potentially dangerous.

-f --status-file

Path to the file keeping the status. When this is set, it allows for the history to be loaded on start.

--log-suffix

Instead of using localslackirc as ident for syslog, this appends a custom string, separated by a -.
This is useful when running several instances, to be able to distinguish the logs.
The default .service file uses this. Of course journald keeps track of the services but this makes it easier to have the information on text dumps or other logging daemons such as rsyslog.

--ignored-channels

Comma separated list of channels to ignore and not automatically join on IRC.
It is ignored unless autojoin is set.
If a channel is in this list, the IRC client will not automatically join it, but on slack you will still be inside the channel
This is useful to avoid off topic channels in which coworkers who can't take a hint keep re-inviting.
The ignored channels can be joined again if needed, with a /join #channel command. However the conversation history will not be fetched.
For channel names containing non ascii characters, their ascii representation needs to be used. Use /list to see which that is.