runuser

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

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

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

       When  called without arguments, runuser defaults to running an interac-
       tive 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.

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

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

       -g, --group=group
              The primary group to be used.  This option is  allowed  for  the
              root user only.

       -G, --supp-group=group
              A supplemental group to be used.  This option is allowed for the
              root user only.

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

                 o      clears all the 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
              Preserve  the  entire  environment,  i.e.  it does not set HOME,
              SHELL, USER nor LOGNAME.  The option is ignored  if  the  option
                        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 vari-
              ables are ignored unless the calling user is root.

       --session-command=command
              Same as -c , but do not create a new session.  (Discouraged.)

       -V, --version
              Display version information and exit.

       -h, --help
              Display help text and exit.

CONFIG FILES
       runuser reads the /etc/default/runuser and  /etc/login.defs  configura-
       tion  files.   The  following  configuration  items  are  relevant  for
       runuser:

       ENV_PATH (string)
           Defines the PATH environment variable  for  a  regular  user.   The
           default value is /usr/local/bin:/bin:/usr/bin.

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

       ALWAYS_SET_PATH (boolean)
           If set to yes and --login and --preserve-environment were not spec-
           ified runuser initializes PATH.

EXIT STATUS
       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 was not found

FILES
       /etc/pam.d/runuser
                        default PAM configuration file
       /etc/pam.d/runuser-l
                        PAM configuration file if --login is specified
       /etc/default/runuser
       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                         July 2014                        RUNUSER(1)
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