[Nix-dev] Insert a ${} literally

[Vladimír Čunát]

Hi,
you need to anti-quote the ${ occurences. That's by \ in 
quotation-mark-delimited strings and by double-apostrophe in 
double-apostrophe-delimited strings. Details are in the manual:
http://nixos.org/nix/manual/#ssec-values

Vladimir


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