The application tar is ubiquitous in the Unix/Linux world. It rolls multiple files and directories into a single “tarball”, which can be transferred more easily and expanded at its destination. A single option, -z applies a compression to the resulting tarball, giving the file the by now well-known extension .tar.gz (for tar-balled and g-zipped). Extracting this file involves two operations, in which first the compression is removed and then the tarball unrolled.
The easiest way to back up a... [More]