Editing Debian package management

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== intro ==
* dpkg – Debian package … – for handling the packages themselves
* APT – "Advanced Packaging Tool" – on top of dpkg commands, dealing with dependencies and repositories
* apt-... – addons to APT
== APT ==
== APT ==


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* https://manpages.debian.org/unstable/apt/apt-cache.8.en.html
* https://manpages.debian.org/unstable/apt/apt-cache.8.en.html
<pre>
# ...
apt-cache pkgnames | sort
# perform a full text search on all available package lists for the POSIX regex pattern given
# (options available)
$ apt-cache search regex...
$ apt-cache search --names-only regex...
$ apt-cache search --full regex...
</pre>


=== apt-get -- APT package handling utility -- command-line interface ===
=== apt-get -- APT package handling utility -- command-line interface ===
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<pre>$ sudo apt-get update</pre>
<pre>$ sudo apt-get update</pre>


==== APT: installing ... ====
=== APT: installing ... ===
<pre>
<pre>
$ sudo apt-get install PACKAGE
$ sudo apt-get install PACKAGE
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# just download it to the cache directory being specified (instead of /var/cache/apt/archives/):
# just download it to the cache directory being specified (instead of /var/cache/apt/archives/):
$ sudo apt-get install --download-only --option dir::cache=$HOME/tmp PACKAGE
$ sudo apt-get install --download-only --option dir::cache=$HOME/tmp PACKAGE
# install PACKAGE
$ sudo apt-get install PACKAGE
</pre>
</pre>


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</pre>
</pre>


==== APT: removing ... ====
=== APT: removing ... ===
<pre>
<pre>
$ sudo apt-get remove PACKAGE
$ sudo apt-get remove PACKAGE
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==== installing a Debian package ====
==== installing a Debian package ====
<pre>$ sudo dpkg --install PACKAGE.deb</pre>
<pre>$ sudo dpkg --install PACKAGE.deb</pre>
==== removing a Debian package ====
<pre>$ sudo dpkg --remove PACKAGE</pre>
==== verifying a Debian package ====
<pre>$ sudo dpkg --verify PACKAGE</pre>


=== dpkg-deb -- Debian package archive (.deb) manipulation tool ===
=== dpkg-deb -- Debian package archive (.deb) manipulation tool ===
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==== what's the content of an installed package (e.g. PACKAGE) ====
==== what's the content of an installed package (e.g. PACKAGE) ====
<pre>$ dpkg-query --listfiles PACKAGE</pre>
<pre>$ dpkg-query --listfiles PACKAGE</pre>
==== what conffiles does an installed package (e.g. PACKAGE) include ====
<pre>$ dpkg-query --showformat='${Conffiles}\n' --show PACKAGE
$ dpkg-query --showformat='${Conffiles}\n' --show PACKAGE | perl -pe 's/^ \s* (.*?) \s* \w+ $/$1/x'</pre>
===== backup all the conffiles of an installed package (e.g. PACKAGE), each one for itself =====
<pre>$ sudo ~jochen.hayek/bin/create_snapshot.sh $( dpkg-query --showformat='${Conffiles}\n' --show PACKAGE | perl -pe 's/^ \s* (.*?) \s* \w+ $/$1/x' )</pre>
===== backup all the conffiles of an installed package (e.g. PACKAGE) to a single tarball =====
<pre>$ sudo tar cvf ~/tmp/PACKAGE.conffiles-$(date '+%Y%m%d%H%M%S').tar --directory / $( dpkg-query --showformat='${Conffiles}\n' --show PACKAGE | perl -pe 's/^ \s* (.*?) \s* \w+ $/$1/x' )</pre>


==== which installed package includes a certain FILE (utility, ...)? ====
==== which installed package includes a certain FILE (utility, ...)? ====
<pre>$ dpkg-query --search FILE</pre>
<pre>$ dpkg-query --search FILE</pre>
= misc =
* https://superuser.com/questions/408082/how-do-i-get-a-list-of-available-i-e-uninstalled-packages-in-debian How do I get a list of available (i.e. uninstalled) packages in Debian?


= dpkg-source -- Debian source package (.dsc) manipulation tool =
= dpkg-source -- Debian source package (.dsc) manipulation tool =
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