Linux man pages : su (1)
SU(1) FSF SU(1)
su - run a shell with substitute user and group IDs
su [OPTION]... [-] [USER [ARG]...]
Change the effective user id and group id to that of USER.
-, -l, --login
make the shell a login shell
pass a single COMMAND to the shell with -c
pass -f to the shell (for csh or tcsh)
do not reset environment variables
-p same as -m
run SHELL if /etc/shells allows it
--help display this help and exit
output version information and exit
A mere - implies -l. If USER not given, assume root.
Written by David MacKenzie.
Report bugs to <email@example.com>.
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
The full documentation for su is maintained as a Texinfo manual. If
the info and su programs are properly installed at your site, the com-
should give you access to the complete manual.
su (coreutils) 4.5.3 February 2003 SU(1)