Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] uncompress command unpacking archives unresponsive programs returning to shell prompt unsetting permissions updating personal information chfn command 2nd uptime command 2nd user accounts case sensitivity root 2nd user permissions usernames utilities bzip2 2nd finger 2nd as security risk tar 2nd 3rd 4th unzip 2nd yppasswd 2nd zip 2nd uuencode 2nd |