L in u X ba sics for h acke rs g e t t I n g s t a r t e d w I t h

97
kali >gunzip HackersArise.*
Once uncompressed, the file is no longer saved with the .tar.gz exten-
sion but with the .tar extension instead. Also, notice that it has returned to 
its original size of 40,960 bytes. Try doing a long list to confirm this. 
Compressing with bzip2
Another of the other widely used compression utilities in Linux is 
bzip2
, 
which works similarly to 
gzip
but has better compression ratios, mean-
ing that the resulting file will be even smaller. You can compress your 
HackersArise.tar file by entering the following:
kali >bzip2 HackersArise.*
When you do a long listing, you can see that 
bzip2
has compressed the 
file down to just 2,081 bytes! Also note that the file extension is now .tar.bz2.
To uncompress the compressed file, use 
bunzip2
, like so:
kali >bunzip2 HackersArise.*
kali >
When you do, the file returns to its original size, and its file extension 
returns to .tar.
Compressing with compress
Finally, you can use the command 
compress
to compress the file. This is 
probably the least commonly used compression utility, but it’s easy to 
remember. To use it, simply enter the command 
compress
followed by the 
filename, like so:
kali >compress HackersArise.*
kali >ls -l
--snip--
-rw-r--r-- 1 root root 5476 Nov 27 2018 13:32 HackersArise.tar.Z
Note that the 
compress
utility reduced the size of the file to 5,476 bytes, 
more than twice the size of 
bzip2
. Also note that the file extension now is 
.tar.Z (with an uppercase Z).
To decompress the same file, use 
uncompress
:
kali >uncompress HackersArise.*
You can also use the 
gunzip
command with files that have been com-
pressed with 
compress
.

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