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This is different that `who` in that who only cares about logged-in users running shells, this command will show all daemon users and what not; also users logged in remotely via SSH but are running SFTP/SCP only and not a shell.
If you can do better, submit your command here.
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I'm looking for exactly this except that I also need to know what these users are running. Can someone help?
wouldn't
ps auxon it's own do what you want? that just lists all running processes and information on them
you can then grep and/or sort on that output