Google also makes it difficult to compile Chromium on platforms where /usr/bin/python is python 3, because their shebangs are:

    #!/usr/bin/env python

Rather than the more portable:

    #!/usr/bin/env python3

Notably this causes problems for people on Arch Linux, and in the near future, Fedora. This post is presented as a style guide that others should adopt. Google may have bash ubiquiotously available internally, but their approach should not be taken as a model for others. Google's approach has caused real problems for their software's portability in exchange for dubious value-adds.

>What about POSIX shell makes it superior for scripting?

To address this specifically, I have written a blog article on the subject:

https://drewdevault.com/2018/02/05/Introduction-to-POSIX-she...

The main points are:

- bash is far from as ubiquitous as some people seem to think it is

- sh is formally standardized and has multiple competing implementations, whereas bash is defined by its implementation and there is only one

- sh is perfectly competent and easy to target, bash's value add is questionable

- By the time you need the things bash offers you might as well not use a shell script at all