[Nix-dev] Escape ${ in multiline string

[4levels]

Great, that did the trick!

To bad I couldn't find this info myself, thanks a lot for your swift
replies!

Kind regards,

Erik

On Tue, Dec 29, 2015 at 1:22 PM Bjørn Forsman <bjorn.forsman at gmail.com>
wrote:

> On 29 December 2015 at 13:05, 4levels <4levels at gmail.com> wrote:
> > Hi Nix Devs,
> >
> > I'm currently struggling to create a bash script within a nix multiline
> > string, terminted by double single quotes.
> >
> > In the bash script, I need to put ${} statements but this is throwing
> > compile errors (Undefined variable error).  I've tried escaping the $
> sign
> > with a backslash, but that doesn't help.  I also tried escaping with a
> > double backslash, same result.
> >
> > Any ideas? Should I rewrite the bash script to not use the ${ statements?
> >
> > Kind regards,
> >
> > code example
> >       s3Backup = name:
> >       ''
> >         ...
> >         DAILYLOGFILE="/var/log/duplicity/backup.log"
> >         ...
> >         # Clear the old daily log file
> >         cat /dev/null > ${DAILYLOGFILE}  // -> compile error: undefined
> > variable DAILYLOGFILE
> >         ...
> >       '';
>
> Try with two single quotes in front of ${DAILYLOGFILE}:
>
>   ''${DAILYLOGFILE}
>
> It is documented here, in the "simple values" section:
>
>   http://nixos.org/nix/manual/#ssec-values
>
> Best regards,
> Bjørn Forsman
>
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