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RUNUSER(1)				  User Commands 			       RUNUSER(1)

       runuser - run a command with substitute user and group ID

       runuser [options] -u user command [argument...]

       runuser [options] [-] [ user [argument...]  ]

       runuser	allows	to  run commands with substitute user and group ID.  If the option -u not
       given, fallback to su compatible semantic and shell is executed.  The  difference  between
       the  commands  runuser and su is that runuser does not ask for password (because it may be
       executed by root user only) and it  uses  a  different  PAM  configuration.   The  command
       runuser does not have to be installed with suid permissions.

       When called without arguments runuser defaults to running an interactive shell as root.

       For  backward  compatibility  runuser  defaults to not change the current directory and to
       only set the environment variables HOME and SHELL (plus USER and  LOGNAME  if  the  target
       user is not root).  This version of runuser uses PAM for session management.

       -c command, --command=command
	      Pass command to the shell with the -c option.

	      Same as -c but do not create a new session (discouraged).

       -f, --fast
	      Pass -f to the shell which may or may not be useful depending on the shell.

       -g, --group=group
	      specify the primary group, this option is allowed for root user only

       -G, --supp-group=group
	      specify a supplemental group, this option is allowed for root user only

       -, -l, --login
	      Starts the shell as login shell with an environment similar to a real login:

		 o	clears all environment variables except for TERM

		 o	initializes the environment variables HOME, SHELL, USER, LOGNAME, PATH

		 o	changes to the target user's home directory

		 o	sets argv[0] of the shell to '-' in order to make the shell a login shell

       -m, -p, --preserve-environment
	      Preserves  the  whole  environment,  ie does not set HOME, SHELL, USER nor LOGNAME.
	      The option is ignored if the option --login is specified.

       -s SHELL, --shell=SHELL
	      Runs the specified shell instead of the default.	The  shell  to	run  is  selected
	      according to the following rules in order:

		 o	the shell specified with --shell

		 o	The  shell specified in the environment variable SHELL if the --preserve-
			environment option is used.

		 o	the shell listed in the passwd entry of the target user

		 o	/bin/sh

	      If the target user has a restricted shell (i.e.  not  listed  in	/etc/shells)  the
	      --shell  option  and the SHELL environment variables are ignored unless the calling
	      user is root.

       --help Display help text and exit.

	      Display version information and exit.

       runuser reads the /etc/default/runuser and /etc/login.defs configuration files.	The  fol-
       lowing configuration items are relevant for runuser:

       ENV_PATH (string)
	   Defines  the  PATH  environment  variable  for  a  regular user.  The default value is

       ENV_ROOTPATH (string)
       ENV_SUPATH (string)
	   Defines the PATH environment variable for root. The default value is  /usr/local/sbin:

       ALWAYS_SET_PATH (boolean)
	   If  set  to yes and --login and --preserve-environment were not specified runuser ini-
	   tializes PATH.

       runuser normally returns the exit status of the command it executed.  If the  command  was
       killed by a signal, runuser returns the number of the signal plus 128.

       Exit status generated by runuser itself:

		 1	Generic error before executing the requested command

		 126	The requested command could not be executed

		 127	The requested command could was not found

			default PAM configuration file
			PAM configuration file if --login is specified
			runuser specific logindef config file
       /etc/login.defs	global logindef config file

       pam(8), shells(5), login.defs(5), su(1)

       Derived	from  coreutils'  su which was based on an implemenation from David MacKenzie and
       Fedora runuser command from Dan Walsh.

       The runuser command is part of the util-linux package and is available from  Linux  Kernel
       Archive <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.

util-linux				   August 2012				       RUNUSER(1)
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