Shell Script

참고자료

https://blog.gaerae.com/2015/01/bash-hello-world.html
https://wiki.kldp.org/HOWTO/html/Adv-Bash-Scr-HOWTO/
http://lsit81.tistory.com/entry/Bash-Shell-Script
http://woowabros.github.io/tools/2017/08/17/ost_bash.html