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I downloaded a gzip-ed, cpio archive yesterday (a .cpgz file) and couldn’t remember how to open it. I was logged into my Mac remotely and was scanning the man pages. When, before you can say Google, I tried the open command. It unpacked the archive without issue. From the open man page:

The open command opens a file (or a directory or URL), just as if you had double-clicked the file’s icon.

This is pretty obvious, but I was pleasantly surprised to encounter this little nicety.