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| Appendix D Problem Checklist |

## D.4 Problems with vi Commands

- When you type commands, text jumps around on the screen and nothing works the way it's supposed to.

  You may have hit the `[CAPS LOCK]` key without noticing it. `vi` is case-sensitive. That is, uppercase commands (`I`, `A`, `J`, etc.) are different from lowercase commands (`i`, `a`, `j`), so all your commands are being interpreted not as lowercase but as uppercase commands. Press the `[CAPS LOCK]` key again to return to lowercase, then type either `U` to restore the last line changed or `u` to undo the last command. You'll probably also have to do some additional editing to fully restore the garbled part of your file.

D.3 Problems Getting to Visual Mode |  | D.5 Problems with Deletions