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UPDATE-RC.D(8)                           Debian GNU/Linux                          UPDATE-RC.D(8)

NAME
       update-rc.d - install and remove System-V style init script links

SYNOPSIS
       update-rc.d [-f] name remove

       update-rc.d name defaults

       update-rc.d name defaults-disabled

       update-rc.d name disable|enable [ S|2|3|4|5 ]

DESCRIPTION
       update-rc.d  updates  the  System V style init script links /etc/rcrunlevel.d/NNname whose
       target is the script /etc/init.d/name.  These links are run by init when it  changes  run-
       levels;  they  are generally used to start and stop system services such as daemons.  run-
       level is one of the runlevels supported by  init,  namely,  0123456789S,  and  NN  is  the
       two-digit sequence number that determines where in the sequence init will run the scripts.

       This  manpage  documents only the usage and behaviour of update-rc.d.  For a discussion of
       the System V style init script arrangements please see init(8) and the Debian Policy  Man-
       ual.

INSTALLING INIT SCRIPT LINKS
       update-rc.d  requires  dependency  and  runlevel  information to be provided in the init.d
       script LSB comment header of all init.d scripts.  See the insserv(8) manual page  for  de-
       tails about the LSB header format.

       When   run   with   the   defaults  option,  update-rc.d  makes  links  named  /etc/rcrun-
       level.d/[SK]NNname that point to the script /etc/init.d/name, using  runlevel  and  depen-
       dency information from the init.d script LSB comment header.

       When  run  with  the  defaults-disabled  option, update-rc.d makes links named /etc/rcrun-
       level.d/KNNname that point to the script /etc/init.d/name,  using  dependency  information
       from the init.d script LSB comment header.  This means that the init.d script will be dis-
       abled (see below).

       If any files named /etc/rcrunlevel.d/[SK]??name already exist then update-rc.d does  noth-
       ing.  The program was written this way so that it will never change an existing configura-
       tion, which may have been customized by the system administrator.  The program  will  only
       install links if none are present, i.e., if it appears that the service has never been in-
       stalled before.

       Older versions of update-rc.d also supported start and stop options.  These options are no
       longer supported, and are now equivalent to the defaults option.

       A  common  system  administration  error is to delete the links with the thought that this
       will "disable" the service, i.e., that this will prevent the service from  being  started.
       However,  if  all  links have been deleted then the next time the package is upgraded, the
       package's postinst script will run update-rc.d again and  this  will  reinstall  links  at
       their  factory default locations.  The correct way to disable services is to configure the
       service as stopped in all runlevels in which it is started by default.  In  the  System  V
       init system this means renaming the service's symbolic links from S to K.

       The script /etc/init.d/name must exist before update-rc.d is run to create the links.

REMOVING SCRIPTS
       When  invoked  with  the  remove  option, update-rc.d removes any links in the /etc/rcrun-
       level.d directories to the script /etc/init.d/name.  The script must have been deleted al-
       ready.  If the script is still present then update-rc.d aborts with an error message.

       update-rc.d  is  usually  called  from a package's post-removal script when that script is
       given the purge argument.  Any files in the /etc/rcrunlevel.d  directories  that  are  not
       symbolic links to the script /etc/init.d/name will be left untouched.

DISABLING INIT SCRIPT START LINKS
       When  run  with  the disable [ S|2|3|4|5 ] options, update-rc.d modifies existing runlevel
       links for the script /etc/init.d/name by renaming start links to stop  links  with  a  se-
       quence number equal to the difference of 100 minus the original sequence number.

       When  run  with  the  enable [ S|2|3|4|5 ] options, update-rc.d modifies existing runlevel
       links for the script /etc/init.d/name by renaming stop links to start  links  with  a  se-
       quence  number equal to the positive difference of current sequence number minus 100, thus
       returning to the original sequence number that the script had been installed  with  before
       disabling it.

       Both of these options only operate on start runlevel links of S, 2, 3, 4 or 5. If no start
       runlevel is specified after the disable or enable keywords, the  script  will  attempt  to
       modify links in all start runlevels.

OPTIONS
       -f     Force removal of symlinks even if /etc/init.d/name still exists.

EXAMPLES
       Insert links using the defaults:
          update-rc.d foobar defaults

       The  equivalent dependency header would have start and stop dependencies on $remote_fs and
       $syslog, and start in runlevels 2-5 and stop in runlevels 0, 1 and 6.

       Remove all links for a script (assuming foobar has been deleted already):
          update-rc.d foobar remove

       Example of disabling a service:
          update-rc.d foobar disable

       Example of a command for installing a system initialization-and-shutdown script:
          update-rc.d foobar defaults

       Example of a command for disabling a system initialization-and-shutdown script:
          update-rc.d foobar disable

BUGS
       See http://bugs.debian.org/sysv-rc and http://bugs.debian.org/init-system-helpers.

FILES
       /etc/init.d/
              The directory containing the actual init scripts.

       /etc/rc?.d/
              The directories containing the links used by init and managed by update-rc.d .

       /etc/init.d/skeleton
              Model for use by writers of init.d scripts.

SEE ALSO
       Debian Policy Manual,
       /etc/init.d/skeleton,
       insserv(8),
       init(8)

AUTHOR
       Ian Jackson, Miquel van Smoorenburg

       Licence: GNU Public Licence v2 or Later (GPLv2+)

COPYRIGHT
       2001 Henrique de Moraes Holschuh

14 November 2005                                                                   UPDATE-RC.D(8)

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