ps options

[Chuck Robey]

I have spent all the time I can stand, going over the ps man page, but I 
can't see any option to get a hierarchical listing.  I mean, where the 
listings are sorted to where parents come before children, and the 
children get indentation, so you can see at a glance what's running more 
easily.  It's a standard thing on many OSes, and I was sorta hoping it'd 
be available on FreeBSD.  Maybe under a different name?