This is a two step command to extract and untar the file.
#tar xvf "filename".tar
This is a one step command to extract and untar the file.
#tar zvxf "filename".tar.gz
z = Gunzip(uncompress) it before extracting, used on file ending in .tar.gz or .tgz
x = Extract the contents of the TAR file
v = Verbose - display contents as it is tarring or extractingf = Filename to follow