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dpkg(1) - phpMan
dpkg(1) dpkg suite dpkg(1)
NAME
dpkg - package manager for Debian
SYNOPSIS
dpkg [option...] action
WARNING
This manual is intended for users wishing to understand dpkg's command line options and
package states in more detail than that provided by dpkg --help.
It should not be used by package maintainers wishing to understand how dpkg will install
their packages. The descriptions of what dpkg does when installing and removing packages
are particularly inadequate.
DESCRIPTION
dpkg is a tool to install, build, remove and manage Debian packages. The primary and more
user-friendly front-end for dpkg is aptitude(1). dpkg itself is controlled entirely via
command line parameters, which consist of exactly one action and zero or more options. The
action-parameter tells dpkg what to do and options control the behavior of the action in
some way.
dpkg can also be used as a front-end to dpkg-deb(1) and dpkg-query(1). The list of sup‐
ported actions can be found later on in the ACTIONS section. If any such action is encoun‐
tered dpkg just runs dpkg-deb or dpkg-query with the parameters given to it, but no spe‐
cific options are currently passed to them, to use any such option the back-ends need to
be called directly.
INFORMATION ABOUT PACKAGES
dpkg maintains some usable information about available packages. The information is
divided in three classes: states, selection states and flags. These values are intended to
be changed mainly with dselect.
Package states
not-installed
The package is not installed on your system.
config-files
Only the configuration files of the package exist on the system.
half-installed
The installation of the package has been started, but not completed for some rea‐
son.
unpacked
The package is unpacked, but not configured.
half-configured
The package is unpacked and configuration has been started, but not yet completed
for some reason.
triggers-awaited
The package awaits trigger processing by another package.
triggers-pending
The package has been triggered.
installed
The package is correctly unpacked and configured.
Package selection states
install
The package is selected for installation.
hold A package marked to be on hold is not handled by dpkg, unless forced to do that
with option --force-hold.
deinstall
The package is selected for deinstallation (i.e. we want to remove all files,
except configuration files).
purge The package is selected to be purged (i.e. we want to remove everything from system
directories, even configuration files).
Package flags
reinst-required
A package marked reinst-required is broken and requires reinstallation. These pack‐
ages cannot be removed, unless forced with option --force-remove-reinstreq.
ACTIONS
-i, --install package-file...
Install the package. If --recursive or -R option is specified, package-file must
refer to a directory instead.
Installation consists of the following steps:
1. Extract the control files of the new package.
2. If another version of the same package was installed before the new installa‐
tion, execute prerm script of the old package.
3. Run preinst script, if provided by the package.
4. Unpack the new files, and at the same time back up the old files, so that if
something goes wrong, they can be restored.
5. If another version of the same package was installed before the new installa‐
tion, execute the postrm script of the old package. Note that this script is exe‐
cuted after the preinst script of the new package, because new files are written at
the same time old files are removed.
6. Configure the package. See --configure for detailed information about how this
is done.
--unpack package-file...
Unpack the package, but don't configure it. If --recursive or -R option is speci‐
fied, package-file must refer to a directory instead.
--configure package...|-a|--pending
Configure a package which has been unpacked but not yet configured. If -a or
--pending is given instead of package, all unpacked but unconfigured packages are
configured.
To reconfigure a package which has already been configured, try the dpkg-reconfig‐
ure(8) command instead.
Configuring consists of the following steps:
1. Unpack the conffiles, and at the same time back up the old conffiles, so that
they can be restored if something goes wrong.
2. Run postinst script, if provided by the package.
--triggers-only package...|-a|--pending
Processes only triggers. All pending triggers will be processed. If package names
are supplied only those packages' triggers will be processed, exactly once each
where necessary. Use of this option may leave packages in the improper trig‐
gers-awaited and triggers-pending states. This can be fixed later by running: dpkg
--configure --pending.
-r, --remove package...|-a|--pending
Remove an installed package. This removes everything except conffiles, which may
avoid having to reconfigure the package if it is reinstalled later (conffiles are
configuration files that are listed in the DEBIAN/conffiles control file). If -a
or --pending is given instead of a package name, then all packages unpacked, but
marked to be removed in file /var/lib/dpkg/status, are removed.
Removing of a package consists of the following steps:
1. Run prerm script
2. Remove the installed files
3. Run postrm script
-P, --purge package...|-a|--pending
Purge an installed or already removed package. This removes everything, including
conffiles. If -a or --pending is given instead of a package name, then all pack‐
ages unpacked or removed, but marked to be purged in file /var/lib/dpkg/status, are
purged.
Note: some configuration files might be unknown to dpkg because they are created
and handled separately through the configuration scripts. In that case, dpkg won't
remove them by itself, but the package's postrm script (which is called by dpkg),
has to take care of their removal during purge. Of course, this only applies to
files in system directories, not configuration files written to individual users'
home directories.
Purging of a package consists of the following steps:
1. Remove the package, if not already removed. See --remove for detailed informa‐
tion about how this is done.
2. Run postrm script.
-V, --verify [package-name...]
Verifies the integrity of package-name or all packages if omitted, by comparing
information from the files installed by a package with the files metadata informa‐
tion stored in the dpkg database. The origin of the files metadata information in
the database is the binary packages themselves. That metadata gets collected at
package unpack time during the installation process.
Currently the only functional check performed is an md5sum verification against the
stored value in the files database. It will only get checked if the database con‐
tains the file md5sum. To check for any missing metadata in the database, the
--audit command can be used.
The output format is selectable with the --verify-format option, which by default
uses the rpm format, but that might change in the future, and as such, programs
parsing this command output should be explicit about the format they expect.
--update-avail, --merge-avail [Packages-file]
Update dpkg's and dselect's idea of which packages are available. With action
--merge-avail, old information is combined with information from Packages-file.
With action --update-avail, old information is replaced with the information in the
Packages-file. The Packages-file distributed with Debian is simply named Packages.
If the Packages-file argument is missing or named - then it will be read from stan‐
dard input (since dpkg 1.17.7). dpkg keeps its record of available packages in
/var/lib/dpkg/available.
A simpler one-shot command to retrieve and update the available file is dselect
update. Note that this file is mostly useless if you don't use dselect but an APT-
based frontend: APT has its own system to keep track of available packages.
-A, --record-avail package-file...
Update dpkg and dselect's idea of which packages are available with information
from the package package-file. If --recursive or -R option is specified, package-
file must refer to a directory instead.
--forget-old-unavail
Now obsolete and a no-op as dpkg will automatically forget uninstalled unavailable
packages.
--clear-avail
Erase the existing information about what packages are available.
-C, --audit [package-name...]
Performs database sanity and consistency checks for package-name or all packages if
omitted. For example, searches for packages that have been installed only par‐
tially on your system or that have missing, wrong or obsolete control data or
files. dpkg will suggest what to do with them to get them fixed.
--get-selections [package-name-pattern...]
Get list of package selections, and write it to stdout. Without a pattern, non-
installed packages (i.e. those which have been previously purged) will not be
shown.
--set-selections
Set package selections using file read from stdin. This file should be in the for‐
mat 'package state', where state is one of install, hold, deinstall or purge. Blank
lines and comment lines beginning with '#' are also permitted.
The available file needs to be up-to-date for this command to be useful, otherwise
unknown packages will be ignored with a warning. See the --update-avail and
--merge-avail commands for more information.
--clear-selections
Set the requested state of every non-essential package to deinstall. This is
intended to be used immediately before --set-selections, to deinstall any packages
not in list given to --set-selections.
--yet-to-unpack
Searches for packages selected for installation, but which for some reason still
haven't been installed.
--add-architecture architecture
Add architecture to the list of architectures for which packages can be installed
without using --force-architecture. The architecture dpkg is built for (i.e. the
output of --print-architecture) is always part of that list.
--remove-architecture architecture
Remove architecture from the list of architectures for which packages can be
installed without using --force-architecture. If the architecture is currently in
use in the database then the operation will be refused, except if --force-architec‐
ture is specified. The architecture dpkg is built for (i.e. the output of
--print-architecture) can never be removed from that list.
--print-architecture
Print architecture of packages dpkg installs (for example, "i386").
--print-foreign-architectures
Print a newline-separated list of the extra architectures dpkg is configured to
allow packages to be installed for.
--compare-versions ver1 op ver2
Compare version numbers, where op is a binary operator. dpkg returns success (zero
result) if the specified condition is satisfied, and failure (nonzero result) oth‐
erwise. There are two groups of operators, which differ in how they treat an empty
ver1 or ver2. These treat an empty version as earlier than any version: lt le eq ne
ge gt. These treat an empty version as later than any version: lt-nl le-nl ge-nl
gt-nl. These are provided only for compatibility with control file syntax: < << <=
= >= >> >.
-?, --help
Display a brief help message.
--force-help
Give help about the --force-thing options.
-Dh, --debug=help
Give help about debugging options.
--version
Display dpkg version information.
dpkg-deb actions
See dpkg-deb(1) for more information about the following actions.
-b, --build directory [archive|directory]
Build a deb package.
-c, --contents archive
List contents of a deb package.
-e, --control filename [directory]
Extract control-information from a package.
-x, --extract archive directory
Extract the files contained by package.
-X, --vextract archive directory
Extract and display the filenames contained by a
package.
-f, --field archive [control-field...]
Display control field(s) of a package.
--fsys-tarfile archive
Display the filesystem tar-file contained by a
Debian package.
-I, --info archive [control-file...]
Show information about a package.
dpkg-query actions
See dpkg-query(1) for more information about the following actions.
-l, --list package-name-pattern...
List packages matching given pattern.
-s, --status package-name...
Report status of specified package.
-L, --listfiles package-name...
List files installed to your system from package-name.
-S, --search filename-search-pattern...
Search for a filename from installed packages.
-p, --print-avail package-name...
Display details about package-name, as found in
/var/lib/dpkg/available. Users of APT-based frontends
should use apt-cache show package-name instead.
OPTIONS
All options can be specified both on the command line and in the dpkg configuration file
/etc/dpkg/dpkg.cfg or fragment files (with names matching this shell pattern '[0-9a-zA-
Z_-]*') on the configuration directory /etc/dpkg/dpkg.cfg.d/. Each line in the configura‐
tion file is either an option (exactly the same as the command line option but without
leading hyphens) or a comment (if it starts with a #).
--abort-after=number
Change after how many errors dpkg will abort. The default is 50.
-B, --auto-deconfigure
When a package is removed, there is a possibility that another installed package
depended on the removed package. Specifying this option will cause automatic decon‐
figuration of the package which depended on the removed package.
-Doctal, --debug=octal
Switch debugging on. octal is formed by bitwise-orring desired values together from
the list below (note that these values may change in future releases). -Dh or
--debug=help display these debugging values.
Number Description
1 Generally helpful progress information
2 Invocation and status of maintainer scripts
10 Output for each file processed
100 Lots of output for each file processed
20 Output for each configuration file
200 Lots of output for each configuration file
40 Dependencies and conflicts
400 Lots of dependencies/conflicts output
10000 Trigger activation and processing
20000 Lots of output regarding triggers
40000 Silly amounts of output regarding triggers
1000 Lots of drivel about e.g. the dpkg/info dir
2000 Insane amounts of drivel
--force-things, --no-force-things, --refuse-things
Force or refuse (no-force and refuse mean the same thing) to do some things. things
is a comma separated list of things specified below. --force-help displays a mes‐
sage describing them. Things marked with (*) are forced by default.
Warning: These options are mostly intended to be used by experts only. Using them
without fully understanding their effects may break your whole system.
all: Turns on (or off) all force options.
downgrade(*): Install a package, even if newer version of it is already installed.
Warning: At present dpkg does not do any dependency checking on downgrades and
therefore will not warn you if the downgrade breaks the dependency of some other
package. This can have serious side effects, downgrading essential system compo‐
nents can even make your whole system unusable. Use with care.
configure-any: Configure also any unpacked but unconfigured packages on which the
current package depends.
hold: Process packages even when marked "hold".
remove-reinstreq: Remove a package, even if it's broken and marked to require rein‐
stallation. This may, for example, cause parts of the package to remain on the sys‐
tem, which will then be forgotten by dpkg.
remove-essential: Remove, even if the package is considered essential. Essential
packages contain mostly very basic Unix commands. Removing them might cause the
whole system to stop working, so use with caution.
depends: Turn all dependency problems into warnings.
depends-version: Don't care about versions when checking dependencies.
breaks: Install, even if this would break another package.
conflicts: Install, even if it conflicts with another package. This is dangerous,
for it will usually cause overwriting of some files.
confmiss: If a conffile is missing and the version in the package did change,
always install the missing conffile without prompting. This is dangerous, since it
means not preserving a change (removing) made to the file.
confnew: If a conffile has been modified and the version in the package did change,
always install the new version without prompting, unless the --force-confdef is
also specified, in which case the default action is preferred.
confold: If a conffile has been modified and the version in the package did change,
always keep the old version without prompting, unless the --force-confdef is also
specified, in which case the default action is preferred.
confdef: If a conffile has been modified and the version in the package did change,
always choose the default action without prompting. If there is no default action
it will stop to ask the user unless --force-confnew or --force-confold is also been
given, in which case it will use that to decide the final action.
confask: If a conffile has been modified always offer to replace it with the ver‐
sion in the package, even if the version in the package did not change. If any of
--force-confmiss, --force-confnew, --force-confold, or --force-confdef is also
given, it will be used to decide the final action.
overwrite: Overwrite one package's file with another's file.
overwrite-dir Overwrite one package's directory with another's file.
overwrite-diverted: Overwrite a diverted file with an undiverted version.
unsafe-io: Do not perform safe I/O operations when unpacking. Currently this
implies not performing file system syncs before file renames, which is known to
cause substantial performance degradation on some file systems, unfortunately the
ones that require the safe I/O on the first place due to their unreliable behaviour
causing zero-length files on abrupt system crashes.
Note: For ext4, the main offender, consider using instead the mount option nodelal‐
loc, which will fix both the performance degradation and the data safety issues,
the latter by making the file system not produce zero-length files on abrupt system
crashes with any software not doing syncs before atomic renames.
Warning: Using this option might improve performance at the cost of losing data,
use with care.
architecture: Process even packages with wrong or no architecture.
bad-version: Process even packages with wrong versions.
bad-path: PATH is missing important programs, so problems are likely.
not-root: Try to (de)install things even when not root.
bad-verify: Install a package even if it fails authenticity check.
--ignore-depends=package,...
Ignore dependency-checking for specified packages (actually, checking is performed,
but only warnings about conflicts are given, nothing else).
--no-act, --dry-run, --simulate
Do everything which is supposed to be done, but don't write any changes. This is
used to see what would happen with the specified action, without actually modifying
anything.
Be sure to give --no-act before the action-parameter, or you might end up with
undesirable results. (e.g. dpkg --purge foo --no-act will first purge package foo
and then try to purge package --no-act, even though you probably expected it to
actually do nothing)
-R, --recursive
Recursively handle all regular files matching pattern *.deb found at specified
directories and all of its subdirectories. This can be used with -i, -A, --install,
--unpack and --avail actions.
-G Don't install a package if a newer version of the same package is already
installed. This is an alias of --refuse-downgrade.
--admindir=dir
Change default administrative directory, which contains many files that give infor‐
mation about status of installed or uninstalled packages, etc. (Defaults to
/var/lib/dpkg)
--instdir=dir
Change default installation directory which refers to the directory where packages
are to be installed. instdir is also the directory passed to chroot(2) before run‐
ning package's installation scripts, which means that the scripts see instdir as a
root directory. (Defaults to /)
--root=dir
Changing root changes instdir to dir and admindir to dir/var/lib/dpkg.
-O, --selected-only
Only process the packages that are selected for installation. The actual marking is
done with dselect or by dpkg, when it handles packages. For example, when a package
is removed, it will be marked selected for deinstallation.
-E, --skip-same-version
Don't install the package if the same version of the package is already installed.
--pre-invoke=command
--post-invoke=command
Set an invoke hook command to be run via “sh -c” before or after the dpkg run for
the unpack, configure, install, triggers-only, remove, purge, add-architecture and
remove-architecture dpkg actions. This option can be specified multiple times. The
order the options are specified is preserved, with the ones from the configuration
files taking precedence. The environment variable DPKG_HOOK_ACTION is set for the
hooks to the current dpkg action. Note: front-ends might call dpkg several times
per invocation, which might run the hooks more times than expected.
--path-exclude=glob-pattern
--path-include=glob-pattern
Set glob-pattern as a path filter, either by excluding or re-including previously
excluded paths matching the specified patterns during install.
Warning: take into account that depending on the excluded paths you might com‐
pletely break your system, use with caution.
The glob patterns use the same wildcards used in the shell, were '*' matches any
sequence of characters, including the empty string and also '/'. For example,
'/usr/*/READ*' matches '/usr/share/doc/package/README'. As usual, '?' matches any
single character (again, including '/'). And '[' starts a character class, which
can contain a list of characters, ranges and complementations. See glob(7) for
detailed information about globbing. Note: the current implementation might re-
include more directories and symlinks than needed, to be on the safe side and avoid
possible unpack failures, future work might fix this.
This can be used to remove all paths except some particular ones; a typical case
is:
--path-exclude=/usr/share/doc/*
--path-include=/usr/share/doc/*/copyright
to remove all documentation files except the copyright files.
These two options can be specified multiple times, and interleaved with each other.
Both are processed in the given order, with the last rule that matches a file name
making the decision.
--verify-format format-name
Sets the output format for the --verify command.
The only currently supported output format is rpm, which consists of a line for
every path that failed any check. The lines start with 9 characters to report each
specific check result, a '?' implies the check could not be done (lack of support,
file permissions, etc), '.' implies the check passed, and an alphanumeric charac‐
ter implies a specific check failed; the md5sum verification is denoted with a '5'
on the third character. The line is followed by a space and an attribute character
(currently 'c' for conffiles), another space and the pathname.
--status-fd n
Send machine-readable package status and progress information to file descriptor n.
This option can be specified multiple times. The information is generally one
record per line, in one of the following forms:
status: package: status
Package status changed; status is as in the status file.
status: package : error : extended-error-message
An error occurred. Any possible newlines in extended-error-message will be
converted to spaces before output.
status: file : conffile-prompt : 'real-old' 'real-new' useredited distedited
User is being asked a conffile question.
processing: stage: package
Sent just before a processing stage starts. stage is one of upgrade, install
(both sent before unpacking), configure, trigproc, disappear, remove, purge.
--status-logger=command
Send machine-readable package status and progress information to the shell com‐
mand's standard input. This option can be specified multiple times. The output for‐
mat used is the same as in --status-fd.
--log=filename
Log status change updates and actions to filename, instead of the default
/var/log/dpkg.log. If this option is given multiple times, the last filename is
used. Log messages are of the form `YYYY-MM-DD HH:MM:SS status state pkg installed-
version' for status change updates; `YYYY-MM-DD HH:MM:SS action pkg installed-ver‐
sion available-version' for actions where action is one of install, upgrade,
remove, purge; and `YYYY-MM-DD HH:MM:SS conffile filename decision' for conffile
changes where decision is either install or keep.
--no-debsig
Do not try to verify package signatures.
--no-triggers
Do not run any triggers in this run (activations will still be recorded). If used
with --configure package or --triggers-only package then the named package postinst
will still be run even if only a triggers run is needed. Use of this option may
leave packages in the improper triggers-awaited and triggers-pending states. This
can be fixed later by running: dpkg --configure --pending.
--triggers
Cancels a previous --no-triggers.
ENVIRONMENT
HOME If set, dpkg will use it as the directory from which to read the user specific con‐
figuration file.
TMPDIR If set, dpkg will use it as the directory in which to create temporary files and
directories.
PAGER The program dpkg will execute when displaying the conffiles.
SHELL The program dpkg will execute when starting a new shell.
COLUMNS
Sets the number of columns dpkg should use when displaying formatted text. Cur‐
rently only used by -l.
DPKG_SHELL_REASON
Defined by dpkg on the shell spawned on the conffile prompt to examine the situa‐
tion. Current valid value: conffile-prompt.
DPKG_CONFFILE_OLD
Defined by dpkg on the shell spawned on the conffile prompt to examine the situa‐
tion. Contains the path to the old conffile.
DPKG_CONFFILE_NEW
Defined by dpkg on the shell spawned on the conffile prompt to examine the situa‐
tion. Contains the path to the new conffile.
DPKG_RUNNING_VERSION
Defined by dpkg on the maintainer script environment to the version of the cur‐
rently running dpkg instance.
DPKG_MAINTSCRIPT_PACKAGE
Defined by dpkg on the maintainer script environment to the (non-arch-qualified)
package name being handled.
DPKG_MAINTSCRIPT_PACKAGE_REFCOUNT
Defined by dpkg on the maintainer script environment to the package reference
count, i.e. the number of package instances with a state greater than
not-installed. Since dpkg 1.17.2.
DPKG_MAINTSCRIPT_ARCH
Defined by dpkg on the maintainer script environment to the architecture the pack‐
age got built for.
DPKG_MAINTSCRIPT_NAME
Defined by dpkg on the maintainer script environment to the name of the script run‐
ning (preinst, postinst, prerm, postrm).
FILES
/etc/dpkg/dpkg.cfg.d/[0-9a-zA-Z_-]*
Configuration fragment files.
/etc/dpkg/dpkg.cfg
Configuration file with default options.
/var/log/dpkg.log
Default log file (see /etc/dpkg/dpkg.cfg(5) and option --log).
The other files listed below are in their default directories, see option --admindir to
see how to change locations of these files.
/var/lib/dpkg/available
List of available packages.
/var/lib/dpkg/status
Statuses of available packages. This file contains information about whether a
package is marked for removing or not, whether it is installed or not, etc. See
section INFORMATION ABOUT PACKAGES for more info.
The status file is backed up daily in /var/backups. It can be useful if it's lost
or corrupted due to filesystems troubles.
The following files are components of a binary package. See deb(5) for more information
about them:
control
conffiles
preinst
postinst
prerm
postrm
triggers
BUGS
--no-act usually gives less information than might be helpful.
EXAMPLES
To list installed packages related to the editor vi(1) (note that dpkg-query does not load
the available file anymore by default, and the dpkg-query --load-avail option should be
used instead for that):
dpkg -l '*vi*'
To see the entries in /var/lib/dpkg/available of two packages:
dpkg --print-avail elvis vim | less
To search the listing of packages yourself:
less /var/lib/dpkg/available
To remove an installed elvis package:
dpkg -r elvis
To install a package, you first need to find it in an archive or CDROM. The available file
shows that the vim package is in section "editors":
cd /media/cdrom/pool/main/v/vim
dpkg -i vim_4.5-3.deb
To make a local copy of the package selection states:
dpkg --get-selections >myselections
You might transfer this file to another computer, and after having updated the available
file there with your package manager frontend of choice (see
https://wiki.debian.org/Teams/Dpkg/FAQ for more details), for example:
apt-cache dumpavail | dpkg --merge-avail
or with dpkg 1.17.6 and earlier:
avail=`mktemp`
apt-cache dumpavail >"$avail"
dpkg --merge-avail "$avail"
rm "$avail"
you can install it with:
dpkg --clear-selections
dpkg --set-selections <myselections
Note that this will not actually install or remove anything, but just set the selection
state on the requested packages. You will need some other application to actually download
and install the requested packages. For example, run apt-get dselect-upgrade.
Ordinarily, you will find that dselect(1) provides a more convenient way to modify the
package selection states.
ADDITIONAL FUNCTIONALITY
Additional functionality can be gained by installing any of the following packages: apt,
aptitude and debsums.
SEE ALSO
aptitude(1), apt(1), dselect(1), dpkg-deb(1), dpkg-query(1), deb(5), deb-control(5),
dpkg.cfg(5), and dpkg-reconfigure(8).
AUTHORS
See /usr/share/doc/dpkg/THANKS for the list of people who have contributed to dpkg.
Debian Project 2014-08-16 dpkg(1)
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