bash cheat sheet

1. Bash keyboard shortcut:

   1. Ctrl + A: Go to the beginning of the line you are currently typing on
   2. Ctrl + E: Go to the end of the line you are currently typing on
   3. Ctrl + L: Clears the Screen, similar to the clear command
   4. Ctrl + U: Clears the line before the cursor position. If you are at the end of the line, clears the entire line.
   5. Ctrl + H: Same as backspace
   6. Ctrl + R: Let's you search through previously used commands
   7. Ctrl + C: Kill whatever you are running
   8. Ctrl + D: Exit the current shell
   9. Ctrl + Z: Puts whatever you are running into a suspended background process. fg restores it.
   10. Ctrl + W: Delete the word before the cursor
   11. Ctrl + K: Clear the line after the cursor
   12. Ctrl + T: Swap the last two characters before the cursor
   13. Esc + T: Swap the last two words before the cursor
   14. Alt + F: Move cursor forward one word on the current line
   15. Alt + B: Move cursor backward one word on the current line
   16. Tab: Auto-complete files and folder names

2. A good reference on how to manage jobs: Job Control

3. online manual
4. assign output of a command to a parameter (i.e. variable)

   var=$(command)

5. assign result of a command to a parameter (i.e. variable)

   var=$((command))

6. square bracket ('[' and ']') means test expression (see manual, section 'Bourne Shell Builtins'). There is a table of Bash Condition Expressions here.