Command Pattern - sgml/signature GitHub Wiki
- https://unix.stackexchange.com/questions/278648/create-histfile-in-subshell
- https://superuser.com/questions/377856/per-directory-bash-zsh-history-log-files
- https://unix.stackexchange.com/questions/6094/is-there-any-way-to-keep-a-command-from-being-added-to-your-history
References https://i.stack.imgur.com/UazA2.png
