- GNU Guide : Parsing-Program-Arguments
- http://nongnu.askapache.com/argpbook/step-by-step-into-argp.pdf
- https://girishjoshi.io/post/glibc-argument-parsing-argp/
- https://azrael.digipen.edu/~mmead/www/Courses/CS180/getopt.html
- i. GNU Manual :
getopt_long
ii. Course Notes :getopt_long