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Shows a list of users that currently running processes are executing as.
YMMV regarding ps and it's many variants. For example, you might need:
ps -axgu | cut -f1 -d' ' | sort -u
There is 1 alternative - vote for the best!
Most systems (at least my macbook) have system users defined, such as _www and using "users" for example will not list them. This command allows you to see who the 'virtual' users are on your system.
If you can do better, submit your command here.
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