expr

 

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 EXPR(1)                        FSF                        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
 
        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.
 
 
 
 GNU sh-utils 2.0.11         July 2001                     EXPR(1)

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