Manual: expr

EXPR(1)					   General Commands Manual				     EXPR(1)

NAME
       expr - Print the value of EXPRESSION to standard output

SYNOPSIS
       expr [--version] [--help] [expression]

DESCRIPTION
       Print the value of EXPRESSION to standard output

OPTIONS
       --version
	      output version information and exit

       --help display this help and exit

       [expression]

EXTRA
       Print  the value of EXPRESSION to standard output. A blank line below separates increasing precedence
       groups.

       EXPRESSION may be:

       - ARG1 | ARG2: ARG1 if it is neither null nor 0, otherwise ARG2 - ARG1 & ARG2: ARG1 if neither  argu‐
       ment  is	 null  or  0, otherwise 0 - ARG1 < ARG2: ARG1 is less than ARG2 - ARG1 <= ARG2: ARG1 is less
       than or equal to ARG2 - ARG1 = ARG2: ARG1 is equal to ARG2 - ARG1 != ARG2: ARG1 is unequal to ARG2  -
       ARG1 >= ARG2: ARG1 is greater than or equal to ARG2 - ARG1 > ARG2: ARG1 is greater than ARG2 - ARG1 +
       ARG2:  arithmetic sum of ARG1 and ARG2 - ARG1 - ARG2: arithmetic difference of ARG1 and ARG2 - ARG1 *
       ARG2: arithmetic product of ARG1 and ARG2 - ARG1 / ARG2: arithmetic quotient of ARG1 divided by	ARG2
       - ARG1 % ARG2: arithmetic remainder of ARG1 divided by ARG2 - STRING : REGEXP: anchored pattern match
       of  REGEXP  in STRING - match STRING REGEXP: same as STRING : REGEXP - substr STRING POS LENGTH: sub‐
       string of STRING, POS counted from 1 - index STRING CHARS: index in STRING where any CHARS is  found,
       or  0  - length STRING: length of STRING - + TOKEN: interpret TOKEN as a string, even if it is a key‐
       word like match
	 or an operator like / - ( EXPRESSION ): value of EXPRESSION

       Beware that many operators need to be escaped or quoted for shells.  Comparisons	 are  arithmetic  if
       both  ARGs  are	numbers, else lexicographical.	Pattern matches return the string matched between \(
       and \) or null; if \( and \) are not used, they return the number of characters matched or 0.

       Exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null or 0, 2  if  EXPRESSION
       is syntactically invalid, and 3 if an error occurred.

       Environment variables:

       -  EXPR_DEBUG_TOKENS=1:	dump  expression's tokens - EXPR_DEBUG_RPN=1: dump expression represented in
       reverse polish notation - EXPR_DEBUG_SYA_STEP=1: dump each parser step - EXPR_DEBUG_AST=1:  dump	 ex‐
       pression represented abstract syntax tree

VERSION
       v(uutils coreutils) 0.8.0

						 2026-04-16					     EXPR(1)