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Dev tools · August 28, 2026

Kosh – Bash shell runtime with 100x faster Shellcheck and LSP built-in

Kosh is a Bash-compatible runtime focused on VERY detailed diagnostics and performance. The project started from frustration with how difficult shell errors can be to debug. And how slow some tools are. The project is feature-complete and the core is usable enough to experiment with. There is a Language Server that works on shell scrips, but I'm planning to expand it to support every conf/YAML/etc file that may have Bash embedded in, e.g. GitHub workflows. Report: bash incompatibility, broken diagnostics, cases where existing tools may solve the problem better Thanks!

What it does

the fastest and most portable cross-platform bash-compatible command interpreter, interactive shell, formatter and language server - toiletbril/kosh

The project was renamed in 0.2.0. The shit is now kosh , shitbox is koshkit , and every prefix is changed to kosh or KOSH_ . I got over the funny name. Thanks. Koshka is an interpreter, interactive shell, formatter and a language server, with first tier support for Windows, Linux and macOS, fully compatible with Bash 5.3 and Dash. Koshka contains ~300 built-in shellcheck diagnostics. It is usually 5x faster than bash, or ~100x+ faster than shellcheck, which makes it exceptionally friendly to coding agents or strict environments where Bash is still used. Koshka aims to be a complete, faster and portable Shellcheck and Bash replacement. The shell guarantees first tier support for Linux, macOS…from github.com

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