For the last one, worth mentioning CDPATH: CDPATH The search path for the cd command. This is a colon-separated list of directories in which the shell looks fo

For the last one, worth mentioning CDPATH: CDPATH The search path for the cd command. This is a colon-separated list of directories in which the shell looks for destination directories specified by the cd command. A sample value is ".:~:/usr". This works with tab completion.