whats the difference between $* and $@ Post: 302158060

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Top Forums Shell Programming and Scripting whats the difference between $* and $@ Post 302158060 by vino on Monday 14th of January 2008 06:25:22 AM

01-14-2008

Registered User

Quote:

Originally Posted by pbsrinivas

Hi,

whats the difference between $* and $@ in command line arguments to a shell scripts

Look into man sh under the section 'Special Parameters'

Code:

       *      Expands  to the positional parameters, starting from one.  When
              the expansion occurs within double quotes, it expands to a sin-
              gle  word  with  the  value  of each parameter separated by the
              first character of the IFS special variable.  That is, "$*"  is
              equivalent  to  "$1c$2c...",  where c is the first character of
              the value of the IFS variable.  If IFS is unset, the parameters
              are  separated  by  spaces.  If IFS is null, the parameters are
              joined without intervening separators.
       @      Expands to the positional parameters, starting from one.   When
              the  expansion  occurs  within  double  quotes,  each parameter
              expands to a separate word.  That is,  "$@"  is  equivalent  to
              "$1"  "$2"  ...   When there are no positional parameters, "$@"
              and $@ expand to nothing (i.e., they are removed).

vino

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LEARN ABOUT HPUX

fdim

fdim(3M)																  fdim(3M)

NAME

       fdim(), fdimf(), fdiml(), fdimw(), fdimq() - positive difference functions

SYNOPSIS

   HP Integrity Server Only
DESCRIPTION

       The function determines the positive difference between its arguments.

   Integrity Server Only
       is a version of it takes arguments and returns a result.

       is a version of it takes arguments and returns a result.

       is an version of it takes arguments and returns an result.

       is equivalent to on HP-UX systems.

USAGE

       To  use	this function, compile either with the default option or with the and options.	To use (for Integrity servers) or compile with the
       option.	Make sure your program includes Link in the math library by specifying on the compiler or linker command line.

RETURN VALUE

       The function returns the positive difference between x and y.

       If x y, returns x y (and raises any exceptions resulting from the subtraction).

       If x y, returns +zero.

       If x or y is NaN, returns NaN.

       If both arguments are NaNs, returns NaN.

       returns a positively signed infinity in lieu of a value whose magnitude is too large, and raises the overflow and inexact exceptions.

ERRORS

       No errors are defined.

SEE ALSO

       fdim(3M), fmin(3M), math(5).

STANDARDS CONFORMANCE

       : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

																	  fdim(3M)

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