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Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject: Re: rsync or even scp questions....
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> How, may I ask, does this work?

If you search the bash man file you can find this and lots of other useful
constructs, search for 'Parameter Expansion' - I'm not sure how much of this
relates to other Bourne Shell derivatives, but I don't imagine it would be
difficult to test it out.