[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] z command (ex)  Z shell  zcat command  zcmp command  zdiff command  zdump command  zforce command  zgrep command  zic command  zless command  zmore command  znew command