Update tar commands

[Edwin van Vliet]

While I was busy installing LFS and BLFS packages, I got annoyed with 
untarring source tarballs. I always seem to forget if something was a 
.tar.gz or a .tar.bz2 archive. Since I like to use the <tab> key, i 
usually typed something like tar -zxf ../pkg<tab>.<tab> for this mostly 
works fine. But if it happenend to be a .tar.bz2 archive, i had to go 
back to the beginning of the line to change -z into -j.

Long story, but since a new version of the tar package is installed 
anyway, and since it supports a cool feature, it might be nice to change 
the few tar commands to:

tar -xf ../pkgbla-1.2.3.tar.gz
The tar package from the standard LFS installation supports this, and I 
like it! No more backtracking to the beginning of the line, just type 
something, use the <tab> key as mush as you like (yay!), and your life 
will be better!

Small change, saves a lot of annoyment, and new linux users should learn 
the power of the <tab> key. Might even be useful to mention this 
somewhere in the LFS book, since the command is user very often.

Example: Vim-6.3
Anyway, even for the old experienced linux users it is nice to know: 
just use tar -xf of tar -xvf for *ANY* .tar.gz, .tar.bz2 or .tar archive  =)
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