tar guessing compression method

Finally (not sure how long ago, but I just found out about it three days ago) the tar unix utility (gnu version) can guess what the compression method to use. Now I can forget that -j is used for bzip2, -z is used for gzip, and some other for xz.
Just use ‘tar axf’ for extraction, and ‘tar acf’ for compression. Everything else is guessed from the file extension!

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