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Why Bash and Zsh compatibility is not automatic
Bash and Zsh share some syntax, but they are not generally interchangeable. The Zsh project FAQ describes them as different programming languages and warns that programs written for either will generally not run under the other. A script may depend on shell-specific syntax, expansions, options, or behavior even if its basic commands look familiar.
That distinction matters for ducksh, too: being a shell does not by itself mean it understands Bash or Zsh programs. The available ducksh overview describes its goals, but does not establish a compatibility mode or supported subset. No compatibility percentage or general pass rate is established by these sources.
First check how the script is run
Standalone script
A script’s interpreter matters more than the shell you use interactively. If a script is written for Bash and has a Bash shebang, run it with Bash; using Zsh as your interactive shell does not require running that script under Zsh. The Zsh FAQ recommends this approach for Bash scripts.
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For example, a script beginning with #!/bin/bash is intended to be interpreted by Bash when launched in the usual way. Do not change the shebang to ducksh or invoke it with ducksh unless ducksh’s documentation says it supports the script’s requirements.
Code sourced into a shell or loaded as a plugin
Sourcing code is different: it runs inside the current shell rather than starting a separate interpreter. A plugin or shell configuration file intended for both Bash and Zsh must account for differences between them. The Zsh FAQ advises careful porting, avoiding incompatible constructs, or handling shell-specific behavior explicitly—for example, by checking whether ZSH_VERSION is set.
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How to assess a particular script
- Identify its intended interpreter. Check the shebang at the top of the file and any project instructions. A Bash shebang is a reason to run it with Bash, not evidence that ducksh can interpret it.
- Determine whether it is launched or sourced. Standalone scripts can use their declared interpreter. Sourced files and plugins execute within the active shell and need deliberate cross-shell support.
- Check for shell-specific behavior. Review syntax, expansions, built-ins, options, and assumptions about the shell environment. Shared-looking syntax alone does not prove compatibility.
- Look for ducksh’s own compatibility documentation. Confirm the supported syntax, invocation method, and any Bash or Zsh mode in current official documentation or release notes. The sources available here do not establish those details.
- Test safely before relying on it. Use a copy or a non-production environment, follow the project’s documented invocation method, and verify outputs and side effects against the script’s expected behavior. A successful run of one script would not establish compatibility with all Bash or Zsh scripts.
Does Zsh compatibility mode help?
Zsh offers sh/ksh emulation when invoked under those names, but its official manual says that this does not guarantee complete emulation of other shells or POSIX compliance. That feature concerns Zsh; it is not evidence that ducksh supports Bash or Zsh compatibility.
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What you can safely conclude
- Ducksh compatibility with existing Bash or Zsh scripts is unverified by the available ducksh source.
- Bash and Zsh are not generally interchangeable, so compatibility should be assessed script by script.
- A standalone script can continue to run under its intended interpreter even when a different shell is used interactively.
- Code sourced into a shell needs explicit cross-shell consideration; do not assume it will behave like a standalone script.
