script

 http://dog0416.blogspot.com/2014/06/dbsql-server.html

https://www.cyberciti.biz/faq/howto-check-if-a-directory-exists-in-a-bash-shellscript/

https://www.cyberciti.biz/faq/check-if-a-directory-exists-in-linux-or-unix-shell/

https://www.cyberciti.biz/faq/howto-check-if-a-directory-exists-in-a-bash-shellscript/

https://stackoverflow.com/questions/59838/how-can-i-check-if-a-directory-exists-in-a-bash-shell-script