Quiz 4
1. Used to run a command in the background.
2. Used to test numeric equality.
3. Used to test string equality.
4. Arithmetic expansion syntax.
5. Conditional test syntax.
6. Command to display system disk usage.
7. Command to display directory usage.
8. Command to show lines at the start of a file.
9. Command to show lines at the end of a file.
10. Command to display file contents.
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