Todd Gamblin ec9456feb8 sbang: convert sbang script to POSIX shell ... `sbang` was previously a bash script but did not need to be. This converts it to a plain old POSIX shell script and adds some options. This also allows us to simplify sbang shebangs to `#!/bin/sh /path/to/sbang` instead of `#!/bin/bash /path/to/sbang`. The new script passes shellcheck (with a few exceptions noted in the file) - [x] `SBANG_DEBUG` env var enables printing what *would* be executed - [x] `sbang` checks whether it has been passed an option and fails gracefully - [x] `sbang` will now fail if it can't find a second shebang line, or if the second line happens to be sbang (avoid infinite loops) - [x] add more rigorous tests for `sbang` behavior using `SBANG_DEBUG`		2020-10-27 13:59:46 -07:00
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spack	sbang: convert sbang script to POSIX shell	2020-10-27 13:59:46 -07:00