What is difference between a job and a process in Unix?

Question

What is the difference between a job and a process in Unix ? Can you please give an example ?

Answer 1

I think a job is a scheduled process or set of processes, a job always has the notion of schedule, otherwise we could call it a process.

Answer 2

A Process Group can be considered as a Job. For example you create a background process group in shell:

$ find $HOME|sort &
[1] 2668

And you can see two processes as members of the new process group:

$ ps -p 2668 -o cmd,pgrp 
CMD                          PGRP
sort                         2667


$ ps -p "$(pgrep -d , -g 2667)" -o cmd,pgrp
CMD                          PGRP
find /home/juergen           2667
sort                         2667

You can can also kill the whole process group/job:

$ pkill -g 2667