CMD.EXE to Nu Comparison Table (Continued)

3rd chunk of `book/coming_from_cmd.md`

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| `IF EXIST <filename> <command>`      | `if (<filename> \| path exists) { <command> }`                                      | Run a command if the file exists                                      |
| `IF DEFINED <variable> <command>`    | `if '$<variable>' in (scope variables).name { <command> }`                          | Run a command if the variable is defined                              |
| `MD` or `MKDIR`                      | `mkdir`                                                                             | Create directories                                                    |
| `MKLINK`                             |                                                                                     | Create symbolic links                                                 |
| `MOVE`                               | `mv`                                                                                | Move files                                                            |
| `PATH`                               | `$env.Path`                                                                         | Display the current path variable                                     |
| `PATH <path>;%PATH%`                 | `$env.Path = ($env.Path \| append <path>`)                                          | Edit the path variable                                                |
| `PATH %PATH%;<path>`                 | `$env.Path = ($env.Path \| prepend <path>`)                                         | Edit the path variable                                                |
| `PAUSE`                              | `input "Press any key to continue . . ."`                                           | Pause script execution                                                |
| `PROMPT <template>`                  | `$env.PROMPT_COMMAND = { <command> }`                                               | Change the terminal prompt                                            |
| `PUSHD <path>`/`POPD`                | `enter <path>`/`dexit`                                                              | Change working directory temporarily                                  |
| `REM`                                | `#`                                                                                 | Comments                                                              |
| `REN` or `RENAME`                    | `mv`                                                                                | Rename files                                                          |
| `RD` or `RMDIR`                      | `rm`                                                                                | Remove directory                                                      |
| `SET <var>=<string>`                 | `$env.<var> = <string>`                                                             | Set environment variables                                             |
| `SETLOCAL`                           | (default behavior)                                                                  | Localize environment changes to a script                              |

Title: CMD.EXE to Nu Comparison Table (Continued)

Summary

This section details the equivalencies between CMD.EXE commands and Nu commands for file existence checks, variable definition checks, directory creation, symbolic link creation, file movement, path variable manipulation, script pausing, terminal prompt customization, temporary directory changes (pushd/popd), commenting, file renaming, directory removal, environment variable setting, and environment localization.