Scribbles for my memory

If you're using Codex CLI and want to insert a newline in the prompt box without submitting, Shift+Enter won't work. Use Ctrl+J instead.

Ctrl+J is the ASCII control character for line feed (\n). Many terminal TUI libraries interpret it as "insert newline" rather than "submit," which is exactly what Codex CLI's input component does.

Shift+Enter looks like the right key (it works in browser-based chat UIs), but whether it inserts a newline or submits depends entirely on how the TUI library handles raw key events — and Codex CLI's library doesn't treat it as a newline.

So: Ctrl+J to insert a newline, Enter to submit.