Delete Directory

rm -r (directory)

======================
: I downloaded Hylafax for installation.  It is in a hylafax.tar.gz format.  I
: think this is a compressed file format. How do I unzip the gz and the tar
: files? 
: Any help is appreciated.

gzip -d <filename> or gunzip <filename>

will simply decompress it.

If you want to decompress and extrace all the files, then 

tar -zxvf <filename>

will do the trick in most cases.

(some older, or non gnu tar programs don't have the decompress option '-z',
so in that case, you'd have to gunzip it first....)