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I'm trying to write some provisioning shell scripts for Vagrant dev environment. I'm used to start bash scripts as follows 

#! /bin/bash

But after surfing through some git repos I found out that in most cases guys use 

#! /usr/bin/env bash

So the question is: what the difference and what is the most decent way to start a bash script? (any alternatives are also appreciated)

ddnomad
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    On the portability front, `/bin/bash` will not exist on a stock BSD system, as for example on OpenBSD, if bash is actually installed, it will be under `/usr/local/bin`, unless the admin has taken additional steps to symlink it to other locations. – thrig Oct 06 '15 at 21:59
  • @thrig, on the portability front, there's no guarantee that env will be `/usr/bin/env` any more than there's a guarantee that `bash` will be `/bin/bash`. Misusing `env` on the shebang line like this doesn't fix the problem, it just shifts it from `bash` to `env`. – cas Oct 25 '15 at 06:03
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    @cas, so what is your point of view? – ddnomad Oct 26 '15 at 08:46

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