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| [ -n "${VAR##[NFnf]*}" ] && echo '$VAR must be truthy (but will be considered falsey by default, if empty)' | |
| [ -z "${VAR##[YTyt]*}" ] && echo '$VAR must be truthy (and will be by default, if empty)' | |
| [ -z "${VAR##[NFnf]*}" ] && echo '$VAR must be falsey (and will be by default, if empty)' | |
| [ -n "${VAR##[YTyt]*}" ] && echo '$VAR must be falsey (but will be considered truthy by default, if empty)' |
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