has

Checks the presence of various command line tools and their installed versions on the PATH, for shell scripts.

Desktopfreeglobal

A small command-line utility that checks whether listed programs are available on the PATH and reports their installed versions, exiting with a status that reflects how many commands were not found. It is intended for shell-script authors and DevOps engineers who want a single, readable prerequisite check; the project is self-hosted, open-source under the MIT License, and depends only on bash.

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Problem & pain-point mapping
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What it's a strong alternative to
Trust & credibility signals

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