https://proglib.io/p/new-linux-tricks/

#http://unix.stackexchange.com/questions/6435/how-to-check-if-pwd-is-a-subdirectory-of-a-given-path
# http://stackoverflow.com/questions/2172352/in-bash-how-can-i-check-if-a-string-begins-with-some-value

2022
https://opensource.com/article/22/11/navigate-linux-terminal-faster