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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.  EXPRES-
     SION 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

     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.

REPORTING BUGS
     Report bugs to <[email protected]>.

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.

COPYRIGHT
     Copyright O 1999 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.

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