https://en.wikipedia.org/wiki/Command-line_interface
https://www.digitalocean.com/community/tutorials/an-introduction-to-the-linux-terminal
https://en.wikipedia.org/wiki/Unix_shell
https://www.gnu.org/software/bash/
ftp://ftp.cwru.edu/pub/bash/FAQ
https://en.wikipedia.org/wiki/Comparison_of_command_shells
https://fossbytes.com/a-z-list-linux-command-line-reference/ https://dev.to/awwsmm/101-bash-commands-and-tips-for-beginners-to-experts-30je
https://www.macs.hw.ac.uk/~hwloidl/Courses/LinuxIntro/x945.html
http://www.freeos.com/guides/lsst/ch02sec01.html
- iTerm2 - Mac
- Hyper - Mac, Linux, Windows
- Terminator - Linux