Answer Posted / unix admin

'Rajhsekhar', 'Swapna' and 'Abdullah' these 3 users
answers also right 100% look at the following example:
using "ps"

/usr/users/operator=>ps
PID TTY S TIME CMD
1683270 pts/0 S 0:00.24 -ksh (ksh)
[operator] AT:/usr/users/operator=>sh
[operator] AT:${PWD}=>ps
PID TTY S TIME CMD
1683270 pts/0 S 0:00.24 -ksh (ksh)
1715181 pts/0 S + 0:00.01 sh
[operator] AT:${PWD}=>


using "echo $0"

/usr/users/operator=>echo $0
-ksh
/usr/users/operator=>sh
[operator] AT:${PWD}=>echo $0
sh
[operator] AT:${PWD}=>

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