tar -xzvf backup.tar.gz
step 2
results
step 3
step 4
create tar.gz file
tar -cvzf backup.tar.gz file1 file2
step 5
results
step 6
step 7
bonus
if you want to see what is inside tar.gz file without extracting
tar -tvzf backap120413.tar.gz
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changing permissions will solve the problem ...