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5.03 Users and System Information Utilities
who - show
who is logged on
-m same as who
am i
-q display only
user names and local number of users on the terminal
-H prints the
headlines
su - run
a shell with substitute user and group ID's
-l login
-c command (Pass
a single Command to the shell with -c) (good in script)
-f fast
-m do not reset
environment variables
sudo - execute
a command as another user (# /etc/sudoers)
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