Start a command then hit the 'tab' key. If not, don't worry, press 'tab' again and all the different choices will appear. This is a trick for people who have many directories, especially ones with long pathnames. It will show you the directory that is saved. Man Pages Unix contains documentation for many programs and topics.
Man pages are also very useful to find related functions and programs.
You Unix account contains personal information about you. This information can be displayed by using the finger program. This is all the information that is contained on the system about you. To change this information use chpass. The editor used is vi.