sh
From NetBSD Wiki
The bourne shell, or sh(1), is the original Unix shell. It is installed on virtually every Unix box on the planet and it is standardized by POSIX.
/bin/sh != /usr/bin/bash
A common annoyance among BSD users is the fact that on Linux, /bin/sh is actually a symlink to shells/bash. This causes a lot of problems because bash is not a strictly POSIX-compliant bourne shell. It does have a POSIX-compatibility mode, but this does not leave out all non-POSIX extensions (as it should). This affects BSD users because it means a lot of Linux users (often unknowningly) really write bash scripts, even though they have #!/bin/sh in their header. These scripts fail miserably on systems where the bourne shell is not a symlink to bash, like NetBSD (or any other BSD, for that matter).
