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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 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 syntacti-
+       cally invalid, and 3 if an error occurred.
+
+AUTHOR
+       Written by Mike Parker.
+
+REPORTING BUGS
+       Report bugs to <bug-coreutils@gnu.org>.
+
+COPYRIGHT
+       Copyright (C) 2004 Free Software Foundation, Inc.
+       This is free software; see the source for copying condi-
+       tions.  There is NO warranty; not even for MERCHANTABIL-
+       ITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+SEE ALSO
+       The  full documentation for expr is maintained as a Tex-
+       info 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.
+
+
+
+expr 5.3.0               November 2004                  EXPR(1)