expr - Online in the Cloud

PROGRAM:

NAME

expr - evaluate expressions

SYNOPSIS

expr EXPRESSION
expr OPTION

DESCRIPTION

--help display this help and exit

--version
output version information and exit

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 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.

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