[Nix-dev] Escape ${ in multiline string

[Fabian Schmitthenner]

You have to escape ${ with '' (so it gets ''${) (as written in the nix
manual)

On 12/29/2015 12:05 PM, 4levels 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
>         ...
>       '';
>
>
> Erik aka 4levels
>
>
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