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Full Discussion: '*' vs. '@' in Korn Shell Array Variables
Top Forums Shell Programming and Scripting '*' vs. '@' in Korn Shell Array Variables Post 302672495 by Clovis_Sangrail on Monday 16th of July 2012 12:08:29 PM
Old 07-16-2012
'*' vs. '@' in Korn Shell Array Variables
In order to use the shellcurses functions described at:

Shell Curses function library

I am learning about ksh, which has arrays. My trusty Kochan & Wood book says that for any Korn Shell array AR :

${AR[*]} expands to all the defined array elements, and

${#AR[*]} expands to the number of array elements.

But the example programs from the above website use '@' instead of '*' in the two expressions above. Both seem to work. My sample program:

Code:
#!/usr/bin/ksh93.att
source /home/lc25487/ksh/shellcurses.ksh
 
MENU[0]="First Menu Line"
MENU[1]="Second Menu Line"
MENU[2]="Third Menu Line"
ITEMCNT=${#MENU[@]}
ITEMCNTSTAR=${#MENU[*]}
ALLITEMS="${MENU[@]}"
ALLITEMSSTAR="${MENU[*]}"
echo
echo ITEMCNT = $ITEMCNT
echo ITEMCNTSTAR = $ITEMCNTSTAR
echo ALLITEMS = $ALLITEMS
echo ALLITEMSSTAR = $ALLITEMSSTAR
echo

produces the following output (on AIX 6.1):

==========
lipossrp01ga:/home/lc25487/ksh $ ./t2.ksh

ITEMCNT = 3
ITEMCNTSTAR = 3
ALLITEMS = First Menu Line Second Menu Line Third Menu Line
ALLITEMSSTAR = First Menu Line Second Menu Line Third Menu Line

lipossrp01ga:/home/lc25487/ksh $
==========

What (if anything} is the difference between the usage of @ or * ?
 

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LEARN ABOUT NETBSD

menu_attributes

MENU_ATTRIBUTES(3)					   BSD Library Functions Manual 					MENU_ATTRIBUTES(3)

NAME

     menu_back, menu_fore, menu_grey, menu_pad, set_menu_back, set_menu_fore, set_menu_grey, set_menu_pad -- get and set menu attributes

LIBRARY

     Curses Menu Library (libmenu, -lmenu)

SYNOPSIS

     #include <menu.h>

     char
     menu_back(MENU *menu);

     char
     menu_fore(MENU *menu);

     char
     menu_grey(MENU *menu);

     int
     menu_pad(MENU *menu);

     int
     set_menu_back(MENU *menu, char attr);

     int
     set_menu_fore(MENU *menu, char attr);

     int
     set_menu_grey(MENU *menu, char attr);

     int
     set_menu_pad(MENU *menu, int pad);

DESCRIPTION

     The menu_back() function returns the value of the background attribute for the menu passed.  This attribute is set by the set_menu_back()
     call.  The menu_fore() function returns the value of the foreground character attribute for the menu passed.  This attribute is set by the
     set_menu_fore() function.	The menu_grey() function returns the value of the grey or unselectable character attribute for the menu passed.
     This attribute is set by the set_menu_grey() function.  The menu_pad() function returns the padding character that will be used between the
     item name and its description.  The value of the pad character is set by the set_menu_pad() function.

RETURN VALUES

     The functions return one of the following error values:

     E_OK		The function was successful.
     E_SYSTEM_ERROR	There was a system error during the call.
     E_BAD_ARGUMENT	One or more of the arguments passed to the function was incorrect.
     E_POSTED		The menu is already posted.
     E_CONNECTED	An item was already connected to a menu.
     E_BAD_STATE	The function was called from within an initialization or termination routine.
     E_NO_ROOM		The menu does not fit within the subwindow.
     E_NOT_POSTED	The menu is not posted.
     E_UNKNOWN_COMMAND	The menu driver does not recognize the request passed to it.
     E_NO_MATCH 	The character search failed to find a match.
     E_NOT_SELECTABLE	The item could not be selected.
     E_NOT_CONNECTED	The item is not connected to a menu.
     E_REQUEST_DENIED	The menu driver could not process the request.

SEE ALSO

     curses(3), menus(3)

NOTES

     The header <menu.h> automatically includes both <curses.h> and <eti.h>.

BSD
								September 10, 1999							       BSD
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