<p>Is there a 7-Zip command-line switch that prevents the filenames from echoing to the screen as they are added to the archive?</p>

If it doesn't have one, you can still redirect the output using
```
>
```
into a file, then deleting the file afterwards. If you are on *nix, you can redirect into
```
/dev/null
```
.
Edit
In MS-DOS and
```
cmd.exe
```
you can redirect into NUL, instead of a file. Thanks to
agnul
for this hint.