Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
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

       + 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.

AUTHOR
       Written by Mike Parker.

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

COPYRIGHT
       Copyright (C) 2002 Free Software	Foundation, Inc.
       This is free software; see the source for copying conditions.  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 coreutils 4.5.3		 February 2003			       EXPR(1)

NAME | SYNOPSIS | DESCRIPTION | AUTHOR | REPORTING BUGS | COPYRIGHT | SEE ALSO

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=expr&sektion=1&manpath=Red+Hat+Linux%2fi386+9>

home | help