Check size directories
$ du -sh *
$ sudo find [path] -name "[filename]"
Unzip tar.gz using tar command
$ tar -xvzf filename.tar.gz
f: this must be the last flag of the command, and the tar file must be immediately after. It tells tar the name and path of the compressed file.
z: tells tar to decompress the archive using gzip
x: tar can collect files or extract them. x does the latter.