Ubuntu commands to remember

Below are some Ubuntu commands that I need to enter on my terminal to do some tasks. I am posting it here, then I will bookmark this page so I could just come here whenever I need them.

For those who’d like to know more about these commands, I am also linking to the pages where I got them.

To enable Internet sharing from PC to Treo:

sudo /usr/local/bin/palm-ppp

To launch Google Video uploader:

 java -jar /opt/GoogleVideoUploader.jarTo convert ogg to avi:

mencoder -idx thefile.ogg -ovc lavc -oac mp3lame -o newfilename.avi