Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [W] [Y] [Z] tail command multiple files, using with number option repeated operation on changing files tar command 2nd testing tarballs prior to untarring untarring and uncompressing tarballs using with compression utilities text editors tilde (~) time, changing on files top command touch command empty files, creating with files, changing to arbitrary time files, updating to current time traceroute command |