start-stop-daemon [option...] command

       start-stop-daemon  is  used  to control the creation and termination of
       system-level  processes.   Using   one   of   the   matching   options,
       start-stop-daemon  can  be  configured  to find existing instances of a
       running process.

       Note:  unless  --pid  or  --pidfile  are  specified,  start-stop-daemon
       behaves similar to killall(1).  start-stop-daemon will scan the process
       table looking for any processes which match the  process  name,  parent
       pid,  uid, and/or gid (if specified). Any matching process will prevent
       --start from starting the daemon. All matching processes will  be  sent
       the  TERM  signal  (or  the  one  specified via --signal or --retry) if
       --stop is specified. For daemons which have long-lived  children  which
       need to live through a --stop, you must specify a pidfile.

       -S, --start [--] arguments
              Check  for  the  existence  of  a  specified process.  If such a
              process exists, start-stop-daemon does nothing, and  exits  with
              error  status 1 (0 if --oknodo is specified).  If such a process
              does not exist, it starts an instance,  using  either  the  exe-
              cutable specified by --exec or, if specified, by --startas.  Any
              arguments given after -- on the command line are passed  unmodi-
              fied to the program being started.

       -K, --stop
              Checks  for  the  existence  of  a specified process.  If such a
              process exists, start-stop-daemon sends it the signal  specified
              by  --signal,  and exits with error status 0.  If such a process
              does not exist, start-stop-daemon exits with error status  1  (0
              if  --oknodo  is  specified).  If  --retry  is  specified,  then
              start-stop-daemon will check that the  process(es)  have  termi-

       -T, --status
              Check  for  the existence of a specified process, and returns an
              exit status code, according  to  the  LSB  Init  Script  Actions
              (since version 1.16.1).

       -H, --help
              Show usage information and exit.

       -V, --version
              Show the program version and exit.

   Matching options
       --pid pid
              Check  for  a  process  with  the  specified  pid (since version
              1.17.6).  The pid must be a number greater than 0.

       --ppid ppid
              might not work as intended with interpreted scripts, as the exe-
              cutable  will  point  to the interpreter. Take into account pro-
              cesses running from inside a chroot will  also  be  matched,  so
              other match restrictions might be needed.

       -n, --name process-name
              Check for processes with the name process-name. The process-name
              is usually the process filename, but it could have been  changed
              by the process itself. Note: on most systems this information is
              retrieved from the process comm  name  from  the  kernel,  which
              tends  to  have  a  relatively short length limit (assuming more
              than 15 characters is non-portable).

       -u, --user username|uid
              Check for processes owned by the user specified by  username  or
              uid.  Note: using this matching option alone will cause all pro-
              cesses matching the user to be acted on.

   Generic options
       -g, --group group|gid
              Change to group or gid when starting the process.

       -s, --signal signal
              With --stop, specifies the signal to  send  to  processes  being
              stopped (default TERM).

       -R, --retry timeout|schedule
              With  --stop,  specifies  that  start-stop-daemon  is  to  check
              whether the process(es) do  finish.  It  will  check  repeatedly
              whether  any  matching processes are running, until none are. If
              the processes do not exit it will then take  further  action  as
              determined by the schedule.

              If  timeout  is specified instead of schedule, then the schedule
              signal/timeout/KILL/timeout is used, where signal is the  signal
              specified with --signal.

              schedule  is  a  list of at least two items separated by slashes
              (/); each item may be -signal-number  or  [-]signal-name,  which
              means  to send that signal, or timeout, which means to wait that
              many seconds for processes to exit, or forever, which  means  to
              repeat the rest of the schedule forever if necessary.

              If  the end of the schedule is reached and forever is not speci-
              fied, then start-stop-daemon exits with error status  2.   If  a
              schedule  is  specified, then any signal specified with --signal
              is ignored.

       -a, --startas pathname
              With --start, start the process specified by pathname.   If  not
              specified, defaults to the argument given to --exec.

       -t, --test
              Print  actions  that  would  be taken and set appropriate return
              also  specify a group by appending a :, then the group or gid in
              the same way as you would for the chown(1) command (user:group).
              If a user is specified without a group, the primary GID for that
              user is used.  When using this option you must realize that  the
              primary  and  supplemental  groups  are set as well, even if the
              --group option is not specified. The --group option is only  for
              groups that the user isn't normally a member of (like adding per
              process group membership for generic users like nobody).

       -r, --chroot root
              Chdir and chroot to root before  starting  the  process.  Please
              note that the pidfile is also written after the chroot.

       -d, --chdir path
              Chdir  to  path  before starting the process. This is done after
              the chroot if the -r|--chroot option is set. When not specified,
              start-stop-daemon will chdir to the root directory before start-
              ing the process.

       -b, --background
              Typically used with programs that don't  detach  on  their  own.
              This option will force start-stop-daemon to fork before starting
              the  process,  and  force  it  into  the  background.   Warning:
              start-stop-daemon  cannot  check  the exit status if the process
              fails to execute for any reason. This is a last resort,  and  is
              only  meant  for  programs  that either make no sense forking on
              their own, or where it's not feasible to add the code  for  them
              to do this themselves.

       -C, --no-close
              Do  not  close  any file descriptor when forcing the daemon into
              the background (since version 1.16.5).  Used for debugging  pur-
              poses to see the process output, or to redirect file descriptors
              to log the process output.  Only  relevant  when  using  --back-

       -N, --nicelevel int
              This alters the priority of the process before starting it.

       -P, --procsched policy:priority
              This  alters  the  process  scheduler policy and priority of the
              process before starting it (since version 1.15.0).  The priority
              can  be  optionally  specified  by appending a : followed by the
              value. The default priority is 0. The currently supported policy
              values are other, fifo and rr.

       -I, --iosched class:priority
              This  alters  the IO scheduler class and priority of the process
              before starting it (since version 1.15.0).  The priority can  be
              optionally specified by appending a : followed by the value. The
              default priority is 4, unless class is idle, then priority  will
              always  be 7. The currently supported values for class are idle,
              best-effort and real-time.

              is usually only  useful  when  combined  with  the  --background

              Used  when  stopping  a program that does not remove its own pid
              file  (since  version   1.17.19).    This   option   will   make
              start-stop-daemon  remove  the  file  referenced  with --pidfile
              after terminating the process.

       -v, --verbose
              Print verbose informational messages.

       0      The requested action was performed. If --oknodo  was  specified,
              it's also possible that nothing had to be done.  This can happen
              when --start was specified and a matching  process  was  already
              running, or when --stop was specified and there were no matching

       1      If --oknodo was not specified and nothing was done.

       2      If --stop and --retry were specified, but the end of the  sched-
              ule was reached and the processes were still running.

       3      Any other error.

       When  using  the  --status  command,  the  following  status  codes are

       0      Program is running.

       1      Program is not running and the pid file exists.

       3      Program is not running.

       4      Unable to determine program status.

       Start the food daemon, unless one is already running (a  process  named
       food, running as user food, with pid in

              start-stop-daemon --start --oknodo --user food --name food \
                   --pidfile /run/ --startas /usr/sbin/food \
                   --chuid food -- --daemon

       Send SIGTERM to food and wait up to 5 seconds for it to stop:

              start-stop-daemon --stop --oknodo --user food --name food \
                   --pidfile /run/ --retry 5

       Demonstration of a custom schedule for stopping food:

              start-stop-daemon --stop --oknodo --user food --name food \
                   --pidfile /run/ --retry=TERM/30/KILL/5
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