Changes

*to login, use an ssh SSH (or similar) program, and provide ''userid '' and ''password''*to backspace (erase), usually '''backspace''', '''control-h''', or '''control-backspace'''*to interrupt a process, usually '''control-c'''*to logout, use <code>exit</code>, <code>logout</code>, or '''control-d'''*use <code>passwd </code> to change password