CMD.EXE to Nu Comparison Table

1st chunk of `book/coming_from_cmd.md`

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# Coming from CMD.EXE

This table was last updated for Nu 0.67.0.

| CMD.EXE                              | Nu                                                                                  | Task                                                                  |
| ------------------------------------ | ----------------------------------------------------------------------------------- | --------------------------------------------------------------------- |
| `ASSOC`                              |                                                                                     | Displays or modifies file extension associations                      |
| `BREAK`                              |                                                                                     | Trigger debugger breakpoint                                           |
| `CALL <filename.bat>`                | `<filename.bat>`                                                                    | Run a batch program                                                   |
|                                      | `nu <filename>`                                                                     | Run a nu script in a fresh context                                    |
|                                      | `source <filename>`                                                                 | Run a nu script in this context                                       |
|                                      | `use <filename>`                                                                    | Run a nu script as a module                                           |
| `CD` or `CHDIR`                      | `$env.PWD`                                                                          | Get the present working directory                                     |
| `CD <directory>`                     | `cd <directory>`                                                                    | Change the current directory                                          |
| `CD /D <drive:directory>`            | `cd <drive:directory>`                                                              | Change the current directory                                          |
| `CLS`                                | `clear`                                                                             | Clear the screen                                                      |
| `COLOR`                              |                                                                                     | Set the console default foreground/background colors                  |
|                                      | `ansi {flags} (code)`                                                               | Output ANSI codes to change color                                     |
| `COPY <source> <destination>`        | `cp <source> <destination>`                                                         | Copy files                                                            |
| `COPY <file1>+<file2> <destination>` | `[<file1>, <file2>] \| each { open --raw } \| str join \| save --raw <destination>` | Append multiple files into one                                        |
| `DATE /T`                            | `date now`                                                                          | Get the current date                                                  |
| `DATE`                               |                                                                                     | Set the date                                                          |
| `DEL <file>` or `ERASE <file>`       | `rm <file>`                                                                         | Delete files                                                          |
| `DIR`                                | `ls`                                                                                | List files in the current directory                                   |

Title: CMD.EXE to Nu Comparison Table

Summary

This table provides a comparison of common commands in CMD.EXE (the Windows command-line interpreter) and their equivalents in Nu, a modern shell. It lists CMD.EXE commands alongside their Nu counterparts, explaining the task each command performs, such as changing directories, clearing the screen, copying files, and deleting files.