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] head command bytes option multiple files, using with number option hidden files, viewing history command .bash history file, security concerns repeating commands repeating the last command home directory 2nd host command |