How to post on twitter from a Unix console !

Its really simple to do it with curl :
[pene@donunix] curl -u twitter_name:twitter_password -d status="$1" http://twitter.com/statuses/update.xml

and, if like me you're in front of the proxy problem :
[pene@donunix] curl -x http://proxyurl:proxyport -U proxy_username -u twitter_name:twitter_password -d status="$1" http://twitter.com/statuses/update.xml