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User Information

id prints information about the given user
id picklu //print information about user(including uid, gid, groups, etc)

whoami //prints the user name associated with the current effective user ID.

groups //prints the names of the primary and any supplementary groups for each

fingers //displays information about the system users

who //show who is logged on
who -a show all users log on to the system in different terminal.

su allows one user to temporarily become another user
su become root user
su - become root user with all the all the environment
su - change to supplied user
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