Topic: Bash

Learn how to use the 'r' command to quickly rerun previous shell commands in your terminal.

Use ctrl+p and ctrl+n to navigate your shell history without moving your hands off the primary keyboard position.

Use ctrl+x and ctrl+e to edit long shell commands in your favorite editor.

Learn how to use arithmetic expansion to calculate numbers in your shell scripts.

Learn how to use imagemagick to change sharp PDFs to look like they've been scanned manually.