Re: [Haskell-cafe] confusion about cabal-install install

* Brandon Allbery [2014-05-10 12:10:03-0400]

On Sat, May 10, 2014 at 11:37 AM, Alexander Solla wrote:

...

But now consider:

$ cabal --version

cabal-install version 1.16.0.2

using version 1.16.0 of the Cabal library

$ which cabal

/home/ajs/.cabal/bin/cabal

$ /home/ajs/.cabal/bin/cabal --version

cabal-install version 1.20.0.1

using version 1.20.0.0 of the Cabal library

This is why I keep, completely pointlessly, telling people to never ever use `which`. It lies. But people want the lies and get confused when they prove to be lies.

Try `type cabal` --- NOT `which cabal` --- to see what is really going on. Then use `hash -r` to fix it.

This problem is specific to bash, I believe. In zsh: % which which which: shell built-in command While `type` is POSIX, the output of `which` (for external commands) is better suited for use in command substitutions, so I mostly prefer it. And once one is aware of the PATH caching, the problem above isn't hard to recognize anyway. Roman