---
name: "uu-expr"
section: "1"
platform: "linux"
package: "uutils-coreutils"
version: "0.12.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/uu-expr"
---

# uu-expr(1)

Print the value of EXPRESSION to standard output

## NAME

expr - Print the value of EXPRESSION to standard output

## SYNOPSIS

**expr** \[EXPRESSION\]\
 **expr** \[OPTIONS\]

## DESCRIPTION

Print the value of EXPRESSION to standard output

## OPTIONS

- **--version**

  output version information and exit

- **--help**

  display this help and exit

- \[*expression*\]

  ## EXTRA

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 argument 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\
       substring 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 keyword 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 expression represented abstract syntax tree

Errors are reported with the expression echoed back and a caret under the offending argument whenever stderr is a terminal; anything else reading stderr gets the usual single-line message.

## VERSION

v(uutils coreutils) 0.12.0