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Linux 2.6 - man page for expr (linux section 1)

EXPR(1) 				  User Commands 				  EXPR(1)

       expr - evaluate expressions

       expr EXPRESSION
       expr OPTION

       --help display this help and exit

	      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

	      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  num-
       ber 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.

       Report expr bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report expr translation bugs to <http://translationproject.org/team/>

       Copyright (C) 2010 Free Software Foundation, Inc.  License GPLv3+: GNU GPL  version  3  or
       later <http://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.

       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 coreutils 'expr invocation'

       should give you access to the complete manual.

GNU coreutils 8.5			  February 2011 				  EXPR(1)

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