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

-c, –command=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

output version information and exit

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

Written by David MacKenzie.

Report bugs to <>.

Copyright © 2008 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <;
This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.


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