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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
       runlevels;  they  are  generally  used  to start and stop system services such as daemons.
       runlevel 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
       Manual.

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
       details about the LSB header format.

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

       When   run   with   the   defaults-disabled   option,   update-rc.d   makes   links  named
       /etc/rcrunlevel.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 disabled (see below).

       If any files  named  /etc/rcrunlevel.d/[SK]??name  already  exist  then  update-rc.d  does
       nothing.   The  program  was  written  this  way  so that it will never change an existing
       configuration, 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 installed 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.  .P The script
       .BI /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/rcrunlevel.d  directories  to the script /etc/init.d/name.  The script must have been
       deleted already.  If the script is still present then update-rc.d  aborts  with  an  error
       message.   .P 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
       sequence 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
       sequence  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.  .P 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

       License: GNU General Public License v2 or Later (GPLv2+)

COPYRIGHT

       2001 Henrique de Moraes Holschuh