How do I run Line CLI in print mode for scripts?

line -p "explain what src/main.rs does"

Print mode runs one turn without the interactive view:

• The answer streams to stdout.
• Tool activity, retries and the usage line go to stderr.
• The run is saved as a session, so line -c -p "continue" picks it up.

Approvals in print mode#

Nobody is there to approve, so anything that would ask is declined ("declined …: run with --yes (or --allowed-tools) to allow it in print mode"). Allow what the job needs with --allowed-tools, --permission-mode accept-edits, or --yes.

Print mode needs a prompt: "--print needs a prompt".