Time saving Tips

1. Command line completion: if you are in the middle of typing a long file name, hit the Tab key to automatically complete that name, if only one file has that name

2. re-executing commands: press the up arrow key to get your previous command. Keep hitting it to get more prior commands.

3. If you want to go to a subdirectory, type only that directory after cd, instead of the whole path.

4. Typing cd .. gets you to the parent directory (one step higher in the directory tree).