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

              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

       quote 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.


AUTHOR

       Written by Mike Parker.


REPORTING BUGS

       Report bugs to <bug-sh-utils@gnu.org>.


COPYRIGHT

       Copyright © 2000 Free Software Foundation, Inc.
       This is free software; see the source for  copying  condi­
       tions.  There is NO warranty; not even for MERCHANTABILITY
       or FITNESS FOR A PARTICULAR PURPOSE.


SEE ALSO

       The full documentation for expr is maintained as a Texinfo
       manual.   If  the  info  and  expr  programs  are properly
       installed at your site, the command

              info expr

       should give you access to the complete manual.


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