Bash

• Redirection in Bash
• Bash quirks

Seems like you can enclose variables into {} when using variables and text together:

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echo "Memory Usage: $uram/${tram}MB ($pram%)"

• bash - Repeatedly run a shell command until it fails?

Semicolon ; is not needed at the end of lines.
You can set strings to interpret escape sequences with $'':

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$ echo $'Name\tAge\nBob\t24\nMary\t36'
Name    Age
Bob     24
Mary    36

• Shell Parameter Expansion (Bash Reference Manual)

Use sudo -H vim /etc/environment. Link.

Is a mess! I don’t even know wtf is going on! #todo!

Links
Difference Between .bashrc, .bash-profile, and .profile

• C

• Learn Bash streams, pipelines and redirection
• Useful terminal and shell commands
• explainshell.com - match command-line arguments to their help text
• command-not-found.com
• Bash Test Operators Cheat Sheet
• Docs, cheatsheets and stuff