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yjftsjthsd-h

Exactly: GNU bash is on most GNU/Linux systems, but:

* mac OS uses an ancient version of bash

* Embedded systems use busybox sh

* Android uses its own version of sh

* None of the BSDs come with bash, since, y'know GNU licensing

EDIT: Formatting

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And to make things interesting Ubuntu uses dash as sh

https://wiki.ubuntu.com/DashAsBinSh

In fairness, that's just for sh; if for some reason you actually need bash you can just use `#!/usr/bin/env bash`

If you actually //need// bash ask for it, not sh.

This comes from more armature script authors not being precise enough with requirements, or not targeting the more common and portable spec.

`sh` is only supposed to be _a_ POSIX-compliant shell, it's not odd/interesting/confusing that Ubuntu uses dash any more than it is that something else uses bash.

The shebang line #!/bin/sh should only be used for POSIX-compliant scripts; if it needs {bash, dash, python, etc.} it should start #!/usr/bin/env {bash, dash, python, etc.}.

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