EXPR(1) | User Commands | EXPR(1) |
expr - evaluate expressions
expr EXPRESSION
expr OPTION
Print the value of EXPRESSION to standard output. A blank line below separates increasing precedence groups. EXPRESSION may be:
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.
Written by Mike Parker, James Youngman, and Paul Eggert.
GNU coreutils online help:
<https://www.gnu.org/software/coreutils/>
Report expr translation bugs to
<https://translationproject.org/team/>
Copyright © 2018 Free Software Foundation, Inc. License
GPLv3+: GNU GPL version 3 or later
<https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO
WARRANTY, to the extent permitted by law.
Full documentation at:
<https://www.gnu.org/software/coreutils/expr>
or available locally via: info '(coreutils) expr invocation'
February 2019 | GNU coreutils 8.30 |