`c8e2a1e`

add compliance matrix to README — 11 shells tested

POSIX, builtin, and integration results for bash, osh, mksh, yash,
dash, zsh, fish, rc, elvish, /bin/sh, and macOS ksh (broken).

OSH (Oils) shows 93% POSIX compliance — strong bash replacement.
mksh and yash beat zsh on POSIX compliance.

Authored by

espadonne 1 month ago

SHA: c8e2a1ea493fc0dceb9af645dc445e619cb449e7
Parents: 04a2ed2
Tree: 08b8089

1 changed file

Status	File	+	-
M	`README.md`	18	0

README.mdmodified

  └── docs/                     # Documentation
  ```
++## Compliance Matrix
++
++Tested on macOS ARM64 (April 2026). POSIX scores are averaged across 7 test suites. Builtins are 605 assertions. Integration is 479 assertions.
++
++| Shell | Version | POSIX | Builtins | Integration | Notes |
++|-------|---------|-------|----------|-------------|-------|
++| **bash** | 5.3 | **~100%** | 93% | 100% | Reference shell |
++| **osh** | 0.37 | **93%** | 91% | — | Oils — bash replacement, excellent compat |
++| **/bin/sh** | bash 3.2 | **97%** | — | — | macOS system shell, lacks bash 4+ features |
++| **mksh** | R59c | **93%** | 87% | 99% | MirBSD Korn Shell |
++| **yash** | 2.60 | **92%** | 88% | 99% | Designed for strict POSIX compliance |
++| **dash** | 0.5.12 | **91%** | 84% | 99% | Debian minimal POSIX shell |
++| **zsh** | 5.9 | **89%** | 89% | 99% | Extensions cause POSIX divergence |
++| **fish** | 4.1 | **31%** | 86% | 98% | Not POSIX — different syntax entirely |
++| **rc** | — | **23%** | 84% | — | Plan 9 shell, not POSIX |
++| **elvish** | 0.21 | **18%** | 75% | — | Modern shell, not POSIX |
++| **ksh** | macOS built-in | **~0%** | — | — | SEGFAULTS — broken system binary |
++
  ## Origin
  bensch was extracted from the [fortsh](https://github.com/FortranGoingOnForty/fortsh) project's test infrastructure, which achieved 1014/1014 interactive test parity across x86 Linux, ARM64 Linux, and macOS ARM64. The framework is 93% shell-agnostic by design.