Experiment with the exec command by writing two series of three shell scripts called:

1) "a.sh", "b.sh", "c.sh"

2) "d.sh", "e.sh", "f.sh".

Each shell from the first sequence will display its name, execute ps command, and then execute the next script in the sequence using exec co mmand (ex: exec b.sh in a.sh)

Each shell from the second sequence will display its name, execute ps command, and then execute the next script in the sequence by just calling its name (ex: e.sh in d.sh) Observe what happens when you start:

a.sh

d.sh

exec a.sh