"Twidge lets you send and receive Twitter or Identi.ca updates
from the command-line. Although micro-blogging from the
command-line may not appeal to you, the command-line makes it easy
to fiddle with Twitter, and Twidge works well in shell scripts. For
example, you can automate sending updates or filter out unwanted
updates from your friends.
"Debian and Ubuntu Jaunty users can install the "twidge"
package. Other users should download the static executable from
Twidge's download page, run bunzip2 on the file, copy it to
/usr/local/bin/twidge, and make it executable with the following
command: chmod +x /usr/local/bin/twidge. You also need to install
your distribution's cURL package."