The TTY demystified
Some history and details about terminals, their history and their working. Likely very useful for people who haven't encountered actual terminal hardware.
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Advanced Bash-Scripting Guide
And advanced guide to bash scripting.
What The @#$%&! (Heck) is this #! (Hash-Bang) Thingy In My Bash Script | Linux Journal
Handy article to help explain shebang to people.