* look into parameter substitution https://www.tldp.org/LDP/abs/html/parameter-substitution.html https://www.tldp.org/LDP/abs/html/parameter-substitution.htm...

* look into parameter substitution https://www.tldp.org/LDP/abs/html/parameter-substitution.html https://www.tldp.org/LDP/abs/html/parameter-substitution.htm... * use traps http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_12_02.html http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_12_02.htm... * read about safe ways to do things in bash https://github.com/anordal/shellharden/blob/master/how_to_do_things_safely_in_bash.md https://github.com/anordal/shellharden/blob/master/how_to_do... * this is pretty helpful writeup of general CLI usage, yet not bash specific https://github.com/jlevy/the-art-of-command-line https://github.com/jlevy/the-art-of-command-line (related HN discussion https://news.ycombinator.com/item?id=9720813 https://news.ycombinator.com/item?id=9720813)