HOW TO USE TARGZ

For compress:

tar -zcf file.tar folder or file to compress or

tar -zcf file.tar file1.txt file2.jpg file3.xml

for unzip: 

tar -xvf file.tar

gzip -9 file.tar

For unzip, first command above wil unzip  format .tar.gz and the second unzip format .tar: 

tar -zxvf file.tar