Minecraft → Players shows who's online and lets you manage the whitelist, operators and bans without typing commands.
- While the server is running, each change is sent as a console command, so it applies straight away.
- While it's stopped, the files are edited directly and the change is there next time it starts.
- While it's starting or stopping, changes are refused. Wait a moment and try again.
Who's online
The list is most accurate with enable-query turned on in your settings. Without it, Minecraft only gives a sample of names, so a busy server may not show everyone.