difference b/t the exit codes $* and $@ Post: 302136729

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Top Forums Shell Programming and Scripting difference b/t the exit codes $* and $@ Post 302136729 by cfajohnson on Wednesday 19th of September 2007 09:53:19 AM

09-19-2007

Registered User

Quote:

Originally Posted by praveen_b744

I know that the exit codes in scripting "$*" will returns all the parameters/arguments passwd to the script.

But I also know that "$@" will also returns the same. What is the difference between those two [ $* and $@ ] ?

"$*" and "$@" are not exit codes; they are the command line arguments.

Exit codes are stored in "$?".

When unquoted, $* and $@ are the same; each word in the argument list becomes a separate word.

When quoted, "$*" returns a single argument containing all the command-line arguments; "$@" presents each command-line argument as a separate argument.

For a demonstration, put the following into a script and exceute it with the arguments: a "b c" "d e f" g.
Code:
printf "\n%s\n" "Using \$\*:"
printf "%s\n" $*

printf "\n%s\n" "Using \$\@:"
printf "%s\n" $@

printf "\n%s\n" "Using \"\$\*\":"
printf "%s\n" "$*"

printf "\n%s\n" "Using \"\$\@\":"
printf "%s\n" "$@"

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LEARN ABOUT OPENSOLARIS

sdl_joystickopen

SDL_JoystickOpen(3)						 SDL API Reference					       SDL_JoystickOpen(3)

NAME

       SDL_JoystickOpen - Opens a joystick for use.

SYNOPSIS

       #include "SDL.h"

       SDL_Joystick *SDL_JoystickOpen(int index);

DESCRIPTION

       Opens a joystick for use within SDL. The index refers to the N'th joystick in the system. A joystick must be opened before it game be used.

RETURN VALUE

       Returns a SDL_Joystick structure on success. NULL on failure.

EXAMPLES

       SDL_Joystick *joy;
       // Check for joystick
       if(SDL_NumJoysticks()>0){
	 // Open joystick
	 joy=SDL_JoystickOpen(0);

	 if(joy)
	 {
	   printf("Opened Joystick 0
       ");
	   printf("Name: %s
       ", SDL_JoystickName(0));
	   printf("Number of Axes: %d
       ", SDL_JoystickNumAxes(joy));
	   printf("Number of Buttons: %d
       ", SDL_JoystickNumButtons(joy));
	   printf("Number of Balls: %d
       ", SDL_JoystickNumBalls(joy));
	 }
	 else
	   printf("Couldn't open Joystick 0
       ");

	 // Close if opened
	 if(SDL_JoystickOpened(0))
	   SDL_JoystickClose(joy);
       }

SEE ALSO

       SDL_JoystickClose

SDL
							      Tue 11 Sep 2001, 23:00					       SDL_JoystickOpen(3)

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