I forgot to mention "shellcheck" at https://www.shellcheck.net/ https://www.shellcheck.net/ and the explanation of its error codes at https://www.shellcheck.net

I forgot to mention "shellcheck" at https://www.shellcheck.net/ https://www.shellcheck.net/ and the explanation of its error codes at https://www.shellcheck.net/wiki/ https://www.shellcheck.net/wiki/ This is also referenced by Shotts, and has been discussed on Hacker News -- not to be missed.