Editing Dpkg

{{lowercase}}
<code>[[Wikipedia:dpkg|dpkg]]</code> ([[1994]]) is a [[package management]] software used among others by Debian operating system. It can be used to install, remove, and provide information about <code>[[.deb]]</code> packages.
* <code>[[dpkg --help]]</code>


New package configurations will append a *.dpkg-old OR *.dpkg-dist.

== Basic dpkg commands ==
* Install a .deb package:
** <code>dpkg -i ''filename.deb''</code>
** <code>dpkg -i -E ''filename.deb''</code> ( <code>-E, [[--skip-same-version]]</code>)  

* Remove an installed package:
** <code>dpkg -r ''package_name''</code>

* Get Information about a package
** <code>[[dpkg -s]] ''package_name''</code> (<code>-s --status</code>). See also: <code>[[apt-cache]] policy package_name</code>

* [[List installed packages]] in your computer can be obtained with:
** <code> [[dpkg -l]] ''[optional pattern]''</code>
* List files in a package:
** <code>[[dpkg -L]] ''package_name''</code>
** <code>[[dpkg-query]] -L ''package_name''</code>

* Find package owner of a file: 
** <code>dpkg -S `which file_to_search`</code> (-S Search)

* List content of a package, content can be extracted suing <code>[[ar]]</code> command:
** <code>dpkg -c /path/to/package_name.deb</code>

{{dpkg changes}}

* <code>[[dpkg --configure -a]]</code><ref> https://www.ostechnix.com/how-to-fix-e-could-not-get-lock-var-lib-dpkg-lock-error-on-ubuntu/</ref>

* <code>[[dpkg-reconfigure]]</code>, <code>[[dpkg-reconfigure openssh-server]]</code>

=== Example Outputs of dpkg commands ===
* <code>dpkg --status [[sysstat]]</code> or <code>dpkg -s [[sysstat]]</code>
<pre>
Package: sysstat
Status: install ok installed
Priority: optional
Section: admin
Installed-Size: 1336
Maintainer: Robert Luberda <robert@debian.org>
Architecture: amd64
Version: 11.4.3-2
Depends: lsb-base (>= 3.0-6), ucf (>= 2.003), xz-utils, debconf (>= 0.5) | debconf-2.0, libc6 (>= 2.14), libsensors4 (>= 1:3.0.0)
Recommends: cron | cron-daemon
Suggests: isag
Conffiles:
 /etc/cron.d/sysstat 455c3c071b6daabb4e4490828975034c
 /etc/cron.daily/sysstat 19b1317e195208eed1a0bcd68be2e637
 /etc/init.d/sysstat 577050178b0105b10118acfe3335de3f
 /etc/sysstat/sysstat ca4bb64ec3044408fed750d0d3d7769a
 /etc/sysstat/sysstat.ioconf fa92b01baa2130e26822c30fb27ac56e
Description: system performance tools for Linux
 The sysstat package contains the following system performance tools:
  - sar: collects and reports system activity information;
  - iostat: reports CPU utilization and disk I/O statistics;
  - tapestat: reports statistics for tapes connected to the system;
  - mpstat: reports global and per-processor statistics;
  - pidstat: reports statistics for Linux tasks (processes);
  - sadf: displays data collected by sar in various formats;
  - cifsiostat: reports I/O statistics for CIFS filesystems.
 .
 The statistics reported by sar deal with I/O transfer rates,
 paging activity, process-related activities, interrupts,
 network activity, memory and swap space utilization, CPU
 utilization, kernel activities and TTY statistics, among
 others. Both UP and SMP machines are fully supported.
Homepage: http://pagesperso-orange.fr/sebastien.godard/
</pre>

== Activities ==
===Basic===
# Read <code>[[apt]]</code> and <code>[[snap]]</code> page
# Install a package using [[dkpg]]
# Understand differences between apt and dpkg

=== Advanced ===
# Read <code>uscan</code>https://manpages.debian.org/buster/devscripts/uscan.1.en.html and https://wiki.debian.org/debian/watch to understand how new packages are generated: https://manpages.debian.org/buster/devscripts/uscan.1.en.html
# Learn about <code>[[dpkg -V]]</code> and [[dpkg -C]]</code> options

== See Also ==
* {{apt}}
* {{package managers}}
* {{dpkg}}
* {{snap}}
* [[wikipedia:Deb_(file_format)]] to understand ''.deb'' internal format an included files: ''preinst, postinst, prerm and postrm.''
* [[wikipedia:apt-file]] to view the contents of debian packages on remote repositories

{{CC license}}. Source: https://en.wikiversity.org/wiki/Linux_server_administration/dpkg

[[Category:dpkg]]
[[Category:Server administration]]
[[Category:Operating systems]]
[[Category:Linux]]