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Curious - exactly what man page do you find that in? I've always seen that construction but given that it just uses random punctuation it's impossible to Google it. I don't even know what those are called!!

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The chapter on parameter subsitution in the LDP's Bash Scripting Guide is nice for this : http://tldp.org/LDP/abs/html/parameter-substitution.html

That's from the Bash man page. :) If you open it in less, you can do `/ :- RET` to search for `:-` and jump to it, which will take you to that part.

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