zip and unzip

zip.sh

#uncompress .gz file
gunzip -d file_name

# compress
tar -cvzf tarballname.tar.gz itemtocompress

#uncompress
gunzip filename.tar.gz
tar -xvf filename.tar

Task: List the contents of a tar file

Use the following command:
$ tar -tvf file.tar

Task: List the contents of a tar.gz file

Use the following command:
$ tar -ztvf file.tar.gz

Task: List the contents of a tar.bz2 file

Use the following command:
$ tar -jtvf file.tar.bz2

Where,

t: List the contents of an archive
v: Verbosely list files processed (display detailed information)
z: Filter the archive through gzip so that we can open compressed (decompress) .gz tar file
j: Filter archive through bzip2, use to decompress .bz2 files.
f filename: Use archive file called filename