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    Command:

    expr

    
    
    

    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
    
    
           + 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

           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

           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.
    
    
    

    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 coreutils 'expr invocation'
    
           should give you access to the complete manual.
    
    
    

    GNU coreutils 8.4 November 2015 EXPR(1)

    
    
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