It is an indispensible tool for anyone who wants to write portable shell scripts.

All shells are built and included in a single 40MB docker image (no manuals, no completions, just the interpreters).

There are two image flavors:

  - latest: contains the two latest versions of each shell.
  - all: contains all shells we can build.

  - bash: requires no introduction
  - busybox ash: the default busybox shell, other busybox tools not built
  - dash: the de facto shell for scripts
  - ksh93: the fastest most complete bytecode interpreted shell to be abandoned by AT&T
  - mksh / loksh / oksh: different distributions of the BSD port of the public domain ksh88
  - osh: the oil shell, a python-based avant-garde interpreter
  - posh: if you think dash is barebones, you should see this one
  - yash: yet another shell!
  - zsh: the default shell on macos

I'm looking for general feedback and overall portable shell discussion. Thanks!