a.sh

Betty:fake lelf$ cabal --version
cabal-install version 1.22.6.0
using version 1.22.4.0 of the Cabal library 

Betty:fake lelf$ cabal install "mtl-2.2.1" "text-1.2.1.1" "hashable-1.2.3.3" "parsec-3.1.9" "scientific-0.3.3.8" "kill-me-666.666"
Resolving dependencies...
All the requested packages are already installed:
hashable-1.2.3.3
mtl-2.2.1
parsec-3.1.9
scientific-0.3.3.8
text-1.2.1.1
Use --reinstall if you want to reinstall anyway.

Betty:fake lelf$ cabal exec ghc-pkg list
/usr/local/packages/ghc10/lib/ghc-7.10.1/package.conf.d
   Cabal-1.22.2.0
   array-0.5.1.0
   base-4.8.0.0
   bin-package-db-0.0.0.0
   binary-0.7.3.0
   bytestring-0.10.6.0
   containers-0.5.6.2
   deepseq-1.4.1.1
   directory-1.2.2.0
   filepath-1.4.0.0
   ghc-7.10.1
   ghc-prim-0.4.0.0
   haskeline-0.7.2.1
   hoopl-3.10.0.2
   hpc-0.6.0.2
   integer-gmp-1.0.0.0
   pretty-1.1.2.0
   process-1.2.3.0
   rts-1.0
   template-haskell-2.10.0.0
   terminfo-0.4.0.1
   time-1.5.0.1
   transformers-0.4.2.0
   unix-2.7.1.0
   xhtml-3000.2.1
/Users/lelf/srcs/fake/.cabal-sandbox/x86_64-osx-ghc-7.10.1-packages.conf.d
   hashable-1.2.3.3
   mtl-2.2.1
   parsec-3.1.9
   scientific-0.3.3.8
   text-1.2.1.1