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 * ?
When subscript is *, the list of array subscripts for vname is generated ... When subscript is @, same as above, except that when used in double quotes, each array subscript yields a separate argument.
Thanks Scott, that sounds reasonable, it's kind of like the difference between $* and $@ in the Bourne shell. I'm guessing that there is no difference whatsoever between the two expressions for the number of array elements.
It turns out that the korn shell also has array constructs that supply the indices of an array, from 0 up to the largest defined element, either all-at-once or one-at-a-time in a loop.
For an array AR, ${!AR[*]} expands to the string "0 1 2 .. N" . So does the construct ${!AR[@]} but this latter povides one subscript at a time in a 'for' loop, while the former consrtruct feeds everything at once. I have expanded my test program:
Code:
#!/usr/bin/ksh93.att
MENU[0]="First Menu Line"
MENU[1]="Second Menu Line"
MENU[2]="Third Menu Line"
ITEMCNT=${#MENU[@]}
ITEMCNTSTAR=${#MENU[*]}
ALLITEMS="${MENU[@]}"
ALLITEMSSTAR="${MENU[*]}"
BANGCNT="${!MENU[@]}"
BANGCNTSTAR="${!MENU[*]}"
echo
echo ITEMCNT = $ITEMCNT
echo ITEMCNTSTAR = $ITEMCNTSTAR
echo ALLITEMS = $ALLITEMS
echo ALLITEMSSTAR = $ALLITEMSSTAR
echo BANGCNT = $BANGCNT
echo BANGCNTSTAR = $BANGCNTSTAR
echo
echo For Loop for ALLITEMS
echo =================
for STR in "${MENU[@]}"
do
echo $STR
done
echo
echo For Loop for ALLITEMSSTAR
echo =====================
for STR in "${MENU[*]}"
do
echo $STR
done
echo
echo For Loop for BANGNT
echo ===============
for STR in "${!MENU[@]}"
do
echo $STR
done
echo
echo For Loop for BANGNTSTAR
echo ===================
for STR in "${!MENU[*]}"
do
echo $STR
done
echo
When I run it I now get:
Code:
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
BANGCNT = 0 1 2
BANGCNTSTAR = 0 1 2
For Loop for ALLITEMS
=================
First Menu Line
Second Menu Line
Third Menu Line
For Loop for ALLITEMSSTAR
=====================
First Menu Line Second Menu Line Third Menu Line
For Loop for BANGNT
===============
0
1
2
For Loop for BANGNTSTAR
===================
0 1 2
lipossrp01ga:/home/lc25487/ksh $
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07-16-2012
