su -- Command

Substitute user id, become superuser
su [user [command] ]

Default user is  root; default command is sh.  su  changes the real user id
and  the effective  user  id to  that  of the  user.  If user  has a  login
password, su requests it.  Then it executes the specified command.

If command is absent, su invokes an interactive sub-shell.

If user is absent, su assumes user name root (the superuser).

Files

/etc/passwd -- Login names and passwords

See Also

commands,
login,
newgrp,
sh,
superuser

© 2012 by Stephen A. Ness