Provided by: rust-coreutils_0.0.27-3_amd64 
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 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
VERSION
v0.0.27
expr 0.0.27 expr(1)