git ls-files: howto identify new files (added, not committed)?

I would like to see all the added and modified files, so the merge of
git diff --cached --name-only
+
git ls-files --modified --deleted
but without [1]+ Stopped ... in between.

When I use git diff --cached --name-only && git ls-files --modified --deleted I receive:

content/blog/2020/05/artificial-intellect.json
content/blog/2020/05/artificial-intellect.pug

[1]+  Stopped                 git diff --cached --name-only
content/index.json
index.php

Clarification: This is a way to show the files that I intend to add. This is not what the OP was looking for, but I'll leave this post in case it's useful to others.

This seems to show only the files that I have added [to my working copy, not the index] but aren't matched by my standard ignore patterns:

 $ git ls-files --others --exclude-standard

Without --exclude-standard, it also shows files that are ignored when I run git status.

You want to use git diff --cached. With --name-only it'll list all the files you've changed in the index relative to HEAD. With --name-status you can get the status symbol too, with --diff-filter you can specify which set of files you want to show ('A' for newly added files, for instance). Use -M to turn on move detection and -C for copy detection if you want them.

For the strictest reading of what you wrote, git diff --cached --name-only --diff-filter=A will list all the files you've added since HEAD which don't exist in HEAD.