jobs
ShellPackage: bash
The processes started from this shell and still attached to it, with their job numbers. What is listed here dies with the terminal; disown or tmux are the ways to avoid that.
What its options do in the lessons
From the same glossary the lessons render under their commands, so the two cannot disagree.
jobs -l- Adds the PID beside each job — the number
killneeds, since%1only exists inside this shell. jobs -p- The PIDs alone, one per line. The form for a script.