Same using 99% pure POSIX, for shells other than bash #12
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The missing 1% is that POSIX doesn't have "local" or a __clean__ (non kludgy) equivalent. Other than that I'm checking the return value of everything that could conceivably fail, except for `$(pwd)` which imho could be replaced by `$PWD`. Autocompletion is commented out in case you use a non-bash shell which has autocompletion (OpenBSD's ksh at least) and feel like translating that.
Translate to (99%) POSIX sh
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It's 2 commits because I'm an idiot - I uploaded the new file using the browser, saw the option to create a new branch&PR
and, well, it turns out they meant a PR to myself...
Anyway, this should work with any POSIX shell (tested with dash, mksh, oksh, yash),
except that it uses "local" which, while technically non POSIX, is supported by every shell
(or at least I'm not aware of any shell that doesn't have it).