Briefing
On real systems, ps shows the full command line of every process, including secrets people pass as arguments by mistake. Run ps here and read carefully.
Objective List running processes and find the flag in a command argument.
Stuck?
Take it one step at a time. Ask for a hint here, or type help in the terminal to
see the commands this challenge is about. Typing hint works there too.
That is every hint. If you are still stuck, run help in the terminal.