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EXPR(1)                          User Commands                         EXPR(1)
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 lexicographi-
       cal.  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.
AUTHOR
       Written by Mike Parker, James Youngman, and Paul Eggert.
REPORTING BUGS
       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>;
       Report expr translation bugs to <https://translationproject.org/team/>;
COPYRIGHT
       Copyright (C) 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.
SEE ALSO
       Full documentation at: <https://www.gnu.org/software/coreutils/expr>;
       or available locally via: info '(coreutils) expr invocation'
GNU coreutils 8.30                 July 2018                           EXPR(1)