su - run a command with substitute user and group ID
su command without any option
$ su
su command to make the shell a login shell
$ su - user3
To switch to root user
$ su -
To print help options
$ su -h
To switch to a Different User
$ su -l user3
To Use su with sudo command
$ sudo su - user3
To run specific command as a different user
$ su -c pwd user3
To use a different shell
$ su -s /usr/bin/csh
To Execute a command as different user with su command
$ su -c <command> user3
To use a different user in the same environment
$ su -p user3
$ su -m user3
regards,
T.Dhanasekar
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