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SIGKILL cannot be trapped as per [SC2173](https://github.com/koalaman/shellcheck/wiki/SC2173). This is just to avoid showing bad example (which would generate another shellcheck warning). :-)
Add four varying examples found in the wild of problematic code
improvement to explanation.
Use triple backticks rather than indenting for code.
Replaced "Contraindications" with "Exceptions".
Created SC2064 (markdown)