The "chat" command:
This command performs actions associated with the /chat instance on the default remote Fossil repository (the Fossil repository whose URL shows when you run the "fossil remote" command) or to the URL specified by the --remote option. If there is no default remote Fossil repository and the --remote option is omitted, then this command fails with an error.
When there is no SUBCOMMAND (when this command is simply "fossil chat") the response is to bring up a web-browser window to the chatroom on the default system web-browser. You can accomplish the same by typing the appropriate URL into the web-browser yourself. This command is merely a convenience for command-line oriented people.
The following subcommands are supported:
- fossil chat send [ARGUMENTS]
 This command sends a new message to the chatroom. The message to be sent is determined by arguments as follows:
- -f|--file FILENAME
 - File to attach to the message
 - -m|--message TEXT
 - Text of the chat message
 - --unsafe
 - Allow the use of unencrypted http://
 
Additional subcommands may be added in the future.