EXPR(1) EXPR(1) expr -- expr expr --help --version . . : 1 | 2 1, , 0, 2 1 & 2 1, , 0, 0 1 < 2 1 2 1 <= 2 1 2 1 = 2 1 2 1 != 2 1 2 1 >= 2 1 2 1 > 2 1 2 1 + 2 1 2 1 - 2 1 2 1 * 2 1 2 1 / 2 1 2 1 % 2 1 2 : _ ' _ match _ , : _ substr , 1 index , - , 0 length + , , <>, , <> ( ) ', . , , . \( \) ; \( \) , . 0, 0; 1, 0; 2, ; 3, . Mike Parker, James Youngman Paul Eggert. : GNU coreutils: GNU: - (C) 2026 Free Software Foundation, Inc. GPLv3+: GNU GPL 3 . : . , , . . : info '(coreutils) expr invocation' Yuri Chornoivan ; , GNU General Public License Version 3 . . , , : . GNU coreutils 9.11 2026 EXPR(1)