Manual Pages for UNIX Operating System command usage for man expr

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.  EXPRES-
     SION 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



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User Commands                                             EXPR(1)



          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, James Youngman, and Paul Eggert.

REPORTING BUGS
     Report expr bugs to bug-coreutils@gnu.org
     GNU             coreutils             home             page:
     
     General        help        using        GNU        software:
     
     Report        expr        translation        bugs         to
     

COPYRIGHT
     Copyright cO 2010 Free  Software  Foundation,  Inc.   License



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User Commands                                             EXPR(1)



     GPLv3+:      GNU      GPL     version     3     or     later
     .
     This is free software: you are free to change and  redistri-
     bute  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.

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     ___________________________________________
    |   ATTRIBUTE TYPE   |    ATTRIBUTE VALUE  |
    |____________________|______________________|_
    | Availability       |  file/gnu-coreutils |
    |____________________|______________________|_
    | Interface Stability|  Uncommitted        |
    |____________________|_____________________|

NOTES
     Source    for    GNU    coreutils    is     available     on
     http://opensolaris.org.

























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