• Every process belongs to a process group.

• A process group has a group id.

• The group id is typically the same as the process id of one of the processes in the group.

• By default, the process group of a child process is the same as that of its parent (but this can be changed).

Example:

1. Process with pid = 1400 has group id also = 1400.
2. Process with pid = 1400 forks 2 children with pids 1401 and 1405.
3. Process 1401 forks one child with pid = 1407.

What are the group ids?

Process id	Group id
1400	1400
1401
1405
1407