Common commands for decompressing files in linux

A complete collection of decompression commands under

linux.tar
unpacking: tar xvf FileName.tar
packing: tar cvf FileName.tar DirName
(Note: tar is packing, not compression!)

.gz
decompression 1: gunzip FileName.gz
decompression 2: gzip -d FileName .gz
Compression: gzip FileName

.tar.gz and .tgz
Decompression: tar zxvf FileName.tar.gz
Compression: tar zcvf FileName.tar.gz DirName