PPID differs in script and prompt

UNIX for Advanced & Expert Users
1

I tried several times to get answer to the below problem. Someone can please help me?

[tmp]$ cat p1.sh
#!/bin/sh

`./c1.sh &`

while [ 10 -le 11 ]  # indefinite loop
do
       x=5;
done

[tmp]$ cat c1.sh  # sleep for 10 sec and exit
#!/bin/sh
sleep 10;

Execute P1 as ./p1 &

[ tmp]$ ps -eaf | grep c1
pp1   20487     1  0 22:37 pts/14   00:00:00 /bin/sh ./c1.sh

[ tmp]$ ps -eaf | grep p1
pp1   20485 19920  6 22:37 pts/14   00:00:00 /bin/sh ./p1.sh

(1) Why does the PPID of c1.sh has been assigned to 1? Why can't it be PID of p1.sh? Thanks in advance

2

Because the parent script did not wait for the child, the init process "adopted" it.