su

su

 [

option

] [

user

] [

shell_args

]

Create a shell with the effective user ID of another user (that is, login as user ). If no user is specified, create a shell for a privileged user (that is, become a superuser). Enter EOF to terminate. You can run the shell with particular options by passing them as shell_args (e.g., if the shell runs sh , you can specify -c command to execute command via sh , or -r to create a restricted shell).

Option

-

Go through the entire login sequence (i.e., change to user 's environment).