GNU 'tar' saves many files together into a single tape or disk archive, and can restore individual files from the archive.
用來打包和解包
$ tar [OPTION...] [FILE]...
# Create archive.tar from files foo and bar.
$ tar -cf MyProject.tar ~/Project
$ tar [OPTION...] [FILE]...
# List all files in archive.tar verbosely.
$ tar -tvf MyProject.tar
# Extract all files from archive.tar.
$ tar -xf MyProject.tar