The command line client was written for MidnightBSD, but should work on other unix-like systems.
To compile the client, use make. make install will install it into a directory (default /usr/local/bin/jjclient). DESTDIR and prefix are available to be set for advanced users or developers working with software repositories.
jjclient -u yourusername -p yourpassword < sometexttoblog.txt or jjclient -u yourusername -p yourpassword type entry control + D (EOF) on it's own line and return
You may also view the code JJ Unix client on Github