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Assuming I write a shell, is there some form of test harness that ensures that the shell is POSIX compliant (specifically /bin/sh without any of the bash extensions) in that it would run most constructs that /bin/sh supports.

This is the reverse of How can I test for POSIX compliance of shell scripts? in that I am looking for something like a bunch of shell scripts that are POSIX-compliant and we are just testing the shell.

Stéphane Chazelas
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Archimedes Trajano
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    There's http://www.opengroup.org/testing/testsuites/vscpcts2003.htm (and I believe there should be newer things than that) but you'd have to submit a system for certification to obtain it. Might be worth asking on the austin-group-l mailing list. – Stéphane Chazelas Feb 21 '24 at 16:18
  • Major shell have some POSIX compability, and the developers are member of the Austin group (so POSIX standardization): you cannot imagine that many bugs of shell become discussion on that group to interpret and improve wording of POSIX standard. I doubt tests are current on the standard (it is not more a market which provide money, and so incentives) -- So, if a shell doesn't pass a test in compatibility mode, it is probable that the POSIX standard will change to accommodate it (but if other shell developers things differently) – Giacomo Catenazzi Feb 22 '24 at 14:37

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