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Thanks for the feedback. I was trying to make it work on mobile but maybe I didn't test it well in the end.

As for a sample, I will go and try to make something now. Thanks.

One nit: ^D only exits if the cursor is at the beginning of a line. Enter <space>^D and the session remains.

Otherwise, looks good! Use of "env" and proper quoting are strong signals!

Thanks for the clarification. I will see if I can sneak in a note about this in the next update :)

page 112

> if [[ "${1-}" =~ ^-*h(elp)?$ ]]; then

> ... is an option that starts with one or multiple - characters ...

"one or multiple" is + not *. The regex above will also match "h" and "help" without - character(s).