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Checklist

• [x] I've read the guide for contributing.
• [x] I've checked there are no other open pull requests for the same change.
• [x] I've formatted all code changes with ./gradlew lcCodeFormat.
• [x] I've ran all checks with ./gradlew lcChecks.
• [ ] I've updated documentation if needed.
• [x] I've added or updated tests for changes.

Reason for change

When I write a script, I always start with checking that the external tools I need are already installed.

I added a function to simplify that.

Description

shellRun {
  require(isCommandInstalled("git")) { "error: git is not installed" }
}