tar & untar a File ??

TAR
1. tar - cvf test.dat : To tar a file
2.tar -czf test.dat : To tar and zip the file

UNTAR

1. tar -xvf test.tar : To un tar a file.
2. tar -xzf test.tar.gz : To un tar a zipped tar file.
3. tar -xjf test.tar.bz2 : To untar a bzipped file