# expr(1)

## NAME

expr - evaluate experession

## SYNOPSIS

**expr** *arg* ...

## EXAMPLES

**x=`expr** **$x** **+** **1`** # Add 1 to shell variable x

## DESCRIPTION

*Expr* computes the value of its argument and writes the result on standard
output. The valid operators, in order of increasing precedence, are
listed below. Operators grouped by {...} have the same precedence. The
operators are: |, &, {<, <=, ==, !=, >=, >}, {+, -}, *, /, %, and :.
Parentheses are permitted.

## SEE ALSO

**sh(1)**, **test(1)**.