Decoding `realpath: command not found` and Its Chained Errors on macOS

Encountering the `realpath: command not found` error on macOS when running scripts? This often triggers a chain reaction of errors, including `No such file or directory`. This article delves into the root cause of this common issue and provides a simple, effective one-line command to fix your environment and get your development tools (like uvx) back on track.