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Compress files or a directory to xz format. XZ has superior and faster compression than bzip2 in most cases. XZ is superior to 7zip format because it can save file permissions and other metadata data.
There are 3 alternatives - vote for the best!
Using 7z to create archives is OK, but when you use tar, you preserve all file-specific information such as ownership, perms, etc. If that's important to you, this is a better way to do it.
compress directory archive with xz compression, if tar doesn't have the -J option (OSX tar doesn't have -J)
If you can do better, submit your command here.
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