From Spring 2009 -- missing one directory of examples
  https://www.cs.umd.edu/~srhuang/teaching/cmsc212/gdb-tutorial-handout.pdf

RMS's tutorial
  http://www.unknownroad.com/rtfm/gdbtut/gdbfaq.html

Beej's Quick Guide to GDB
  https://beej.us/guide/bggdb/

BASH Programming
  http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html