NAME
    su - run a shell with substitute user and group IDs

SYNOPSIS
    su [OPTION]... [-] [USER [ARG]...]

DESCRIPTION
    Change the effective user id and group id to that of USER.

    -, -l, --login
    make the shell a login shell

    -c, --commmand=COMMAND
    pass a single COMMAND to the shell with -c

    -f, --fast
    pass -f to the shell (for csh or tcsh)

    -m, --preserve-environment
    do not reset environment variables

    -p   same as -m

    -s, --shell=SHELL
    run SHELL if /etc/shells allows it

    --help display this help and exit

    --version
    output version information and exit

    A mere - implies -l.  If USER not given, assume root.

AUTHOR
    Written by David MacKenzie.

REPORTING BUGS
    Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT
    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
    PURPOSE.

SEE ALSO
    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-
    mand

    info su

    should give you access to the complete manual.