Bash Script for posting classified ads online

Hi I need a bash shell script which is able to post classified ads on webpages like [login to view URL] or wantedwants.com. The script needs to be able to accept different ad context, and fields required by the webpages like Location, Title, Description, email address etc. After the posting the ad link needs to be available for further processing in a bash script. Ideally no add-on tools should be used but pure shell scripting, PHP is available. Thanks