Linux shell Kung-Fu

# How to check to see if a script is running as root
https://askubuntu.com/questions/15853/how-can-a-script-check-if-its-being-run-as-root


# How to read from a file
https://www.cyberciti.biz/faq/unix-howto-read-line-by-line-from-file/


# How to check to see if a directory exists
https://www.cyberciti.biz/tips/find-out-if-directory-exists.html

# How to check to see if a file exists
https://www.cyberciti.biz/tips/find-out-if-file-exists-with-conditional-expressions.html


# Run a script against every file in a directory
https://www.cyberciti.biz/faq/bash-loop-over-file/
https://stackoverflow.com/questions/10523415/bash-script-to-execute-command-on-all-files-in-a-directory


# Insert values into a database
https://www.linuxquestions.org/questions/programming-9/shell-script-to-insert-value-in-database-666785/


# Read values from a database
https://www.shellhacks.com/mysql-run-query-bash-script-linux-command-line/

# Parse XML file
http://www.humbug.in/2010/parse-simple-xml-files-using-bash-extract-name-value-pairs-and-attributes/