See content of Tar/tar gz file without extracting it

Have you ever needed to peek inside a tar.gz file in UNIX/Linux terminal when you don't have a GUI option to do so, if so here is the solution you will want to use for it :)

tar -tf tarfileyouwanttopeekin.tar
or
tar -tf tarfileyouwanttopeekin.tar.gz
or
tar -tf tarfileyouwanttopeekin.tar.bz2

if you look into a Zip file :

unzip -l tarfileyouwanttopeekin.zip