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This page is about the ways to list the installed packages in a Debian system and how to create a file with this list. This file can be uploaded to the web (i.e. from other computer with Internet connection) to download new packages.
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=== List all installed packages ===
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With version and architecture information, and description, in a table:
{{{
dpkg-query -l
}}}

Package names only, one per line:
{{{
dpkg-query -f '${binary:Package}\n' -W
}}}

=== List packages using a search pattern ===

It is possible to add a search pattern to list packages:

{{{
dpkg-query -l 'foo*'
}}}

=== Show status of all packages on the system ===

To check the status of all packages on your system:

{{{
dpkg-query -l '*' | less
}}}

This will show all packages (one line each) that are in various stages of installation (including packages that were removed but not purged) and packages just available from a repository. To show only installed packages:

{{{
dpkg -l | grep '^.i'
}}}

you can filter with grep to get results for "i".

You can also use:

{{{
apt-cache pkgnames
}}}

Or you can use dpkg to list the current package selections (the desired state of either installed or to be installed packages):

{{{
dpkg --get-selections
}}}

And store the list of software to a file called /backup/package-selections

{{{
dpkg --get-selections >/backup/package-selections
}}}

You can also find package information in the next directories (you can use DebianPkg:mc or other FileManager to browse them):

 * {{{/var/lib/apt/lists/*}}}
 * {{{/var/lib/dpkg/available}}}: list of available packages from repositories.
 * {{{/var/lib/dpkg/status}}}: status of installed (and available) packages. This file contains information about whether a package is marked for removal or not, whether it is installed or not, etc. A package marked reinst-required is broken and requires reinstallation.

== Restore installed software ==

After re-installing base system you can immediately re-install all software. You need dselect:

{{{
apt-get install dselect
}}}

Then you have to type following commands:

{{{
dpkg --get-selections >/backup/package-selections
dpkg --set-selections </backup/package-selections
}}}

Now that your list is imported use apt-get, [[Synaptic]] or other PackageManagement tools. To install the packages:

{{{
apt-get dselect-upgrade
}}}

All this with a single command:

{{{
aptitude install $(cat /backup/package-selections | awk '{print $1}')
}}}		 See [[AptCLI#List_installed_packages]]

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See AptCLI#List_installed_packages

See also

CategoryPackageManagement