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expr (1)
  • expr (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
  • expr (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
  • expr (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • >> expr (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
  • expr (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )
  • expr (3) ( Linux man: Библиотечные вызовы )
  •  

    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 syntactically invalid, and 3 if an error occurred.  

    AUTHOR

    Written by Mike Parker.  

    REPORTING BUGS

    Report bugs to <bug-coreutils@gnu.org>.  

    COPYRIGHT

    Copyright © 2006 Free Software Foundation, Inc.
    This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. 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 expr

    should give you access to the complete manual.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    AUTHOR
    REPORTING BUGS
    COPYRIGHT
    SEE ALSO


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