# Knowledge Check: Linux and the Shell

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**1. What's the difference between a shell and a terminal?**

*Answer:* The terminal is the window/program that displays text and captures keystrokes; the
shell (e.g. `bash`) is the program actually interpreting what you type as commands. The terminal
is the display, the shell is the brain.

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**2. A command exits with code `0`. What does that tell you?**

*Answer:* It succeeded. `0` is the universal "success" convention every script and pipeline
relies on; any non-zero value means some kind of failure occurred.

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**3. You've typed half a long path and can't remember the rest. What should you press?**

*Answer:* Tab — tab completion finishes the path (or shows the options) without you needing to
type or remember it exactly.

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**4. Where would you look to learn every option a command supports, without leaving the
terminal?**

*Answer:* Its manual page — `man <command>`.

## Instructor Notes

**Facilitation:** Question 1 is the one students most often blur together — worth confirming
verbally before moving on.

**Approximate timing:** 5 minutes.