gwsh is a POSIX shell derived from dash.
Pre-built packages of gwsh are provided for Debian Bookworm and Trixie, for amd64 and arm64 architectures.
To enable the repository and install gwsh:
# cat >/etc/apt/sources.list.d/gwsh.sources <<EOF
Types: deb
URIs: https://hvdijk.github.io/gwsh/
Suites: trixie
Components: main
Signed-By:
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EOF
# apt-get update
# apt-get install gwsh