Test script portability

[bjornbm]

Changes avoiding bash-specifics and GNU extensions for grep.

These now run on, for example, Alpine Linux (with BusyBox grep) and with dash shell.

[hugomg]

I was more used to debian, which uses dash by default but also has bash installed and usable via shebang. If I understand you correctly, alpine doesn't have bash at all?

The testing scripts most often used by developers, which may be more willing to install dependencies. What's the context for alpine in particular? Is it for CI?

[bjornbm]

Alpine is popular in CI and anywhere you want a small linux. I'm using it in a VM (with macpine) to test some of the commits I'm sending you.

Alpine doesn't come with bash, but it can be installed (apk add bash).

In some environments bash is not available due to the license (obscure example).

I'm not sure the long grep flags are supported on all the BSDs… it seems they are not on OpenBSD.

Agreed that most developers will have/be willing to install bash on their dev machines. And GNU (or other) grep. And I could too on my VM. But I feel the cost of portability is low here as the scripts didn't really rely on “bashisms” or GNU extensions.