PS Command

Hi

Can anybody tell me the difference between the e,f,d
in this command "ps -edf" and "ps -ed"

I did man ps but i need a better explanation about differences about
the e,d,f

Regards

-e Select all processes.
-d Select all processes except process group leader
-f Show columns user, pid, ppid, cpu, stime, tty, time, and args, in that order.

Pretty self explanitory except maybe the group leader, maybe a quick google might explain that one.

Or perhaps your -e, -d, and -f are different in your unix flavor.