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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.
There are 2 alternatives - vote for the best!
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
If you can do better, submit your command here.
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