[TriLUG] OT: Linux/UNIX book recommendations needed

[Greg Brown]

A good friend of mine landed a job down in CLT and he has to learn 
about system administration of all things command line.  Not only does 
he need to know administration he needs to learn about the general 
workings and operations of:

UNIX (AIX, Solaris, and maybe HP-UX)
Linux (not sure which distro, probably RH)
BSD (unsure of which distro, probably FreeBSD)

(I've already told him to get on the list, get some extra hardware 
thrown together, and install the some distros).

Marty, the friend who landed the job, already has a strong background 
in MS systems as well as routed networks from the very tiny to the 
very, very large.  He's smarter than the average bear so he's able to 
pick things up fairly quickly, but the books still have to cover the 
basics then hopefully progress to more difficult topics.  That said, 
what books do you recommend?

I was thinking of Essential System Administration by Aeleen Frisch 
would be a good one.

What are the other good ones?

Greg