Unix room pronunciation:

ed: Ed or E.D.; both were common

chroot: cheroot 

chgrp: ch-group
chown: rhymes with "clone"
chmod: rhymes with "god"
creat: cree-at
nroff: enn-roff (because it was the descendant of roff)
troff: tee-roff

vi: (for those few who used it) V.I. I pronounced it V.I. but often thought of Roman numerals.

Also a side note about vi: Plan 9 had another program with that name. http://man.cat-v.org/plan_9/1/vi. The 'v' meant mips for obscure but consistent reasons. Yet another reason the command was pronounced V.I. regardless of its function.

-rob