spec test index / oilshell.org
| case | bash | zsh | osh | description |
| 0 | pass | pass | pass | Process sub input |
| 1 | pass | pass | pass | Process sub output |
| 2 | pass | pass | pass | Non-linear pipeline with >() |
9 passed, 0 ok, 0 known unimplemented, 0 known bugs, 0 failed, 0 skipped