Packages registered with ghc are placed in the .ghc directory.  You can delete the directory entirely or selectively unregister using ghc-pkg.

On Dec 3, 2017 10:31 AM, "Volker Wysk" <post@volker-wysk.de> wrote:
Hi!

I want to remove eveything which cabal has installed, and begin again with a clean installation. How is this accomplished? I've deleted ~/.cabal, but it still says that hsshellscript is already installed:

desktop ~ $ cabal install hsshellscript
Resolving dependencies...
All the requested packages are already installed:
hsshellscript-3.4.3
Use --reinstall if you want to reinstall anyway.

Bye
V.W.

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