doc/apt-get.8.xml

   1 <?xml version="1.0" encoding="utf-8" standalone="no"?>
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" [
   4
   5 <!ENTITY % aptent SYSTEM "apt.ent">
   6 %aptent;
   7
   8 <!ENTITY % aptverbatiment SYSTEM "apt-verbatim.ent">
   9 %aptverbatiment;
  10
  11 ]>
  12
  13 <refentry>
  14
  15  <refentryinfo>
  16    &apt-author.jgunthorpe;
  17    &apt-author.team;
  18    &apt-email;
  19    &apt-product;
  20    <!-- The last update date -->
  21    <date>08 November 2008</date>
  22  </refentryinfo>
  23
  24  <refmeta>
  25    <refentrytitle>apt-get</refentrytitle>
  26    <manvolnum>8</manvolnum>
  27    <refmiscinfo class="manual">APT</refmiscinfo>
  28  </refmeta>
  29
  30  <!-- Man page title -->
  31  <refnamediv>
  32     <refname>apt-get</refname>
  33     <refpurpose>APT package handling utility -- command-line interface</refpurpose>
  34  </refnamediv>
  35
  36  <!-- Arguments -->
  37  <refsynopsisdiv>
  38    <cmdsynopsis>
  39       <command>apt-get</command>
  40       <arg><option>-sqdyfmubV</option></arg>
  41       <arg>
  42               <option>-o=
  43                           <replaceable>config_string</replaceable>
  44               </option>
  45       </arg>
  46       <arg>
  47               <option>-c=
  48                       <replaceable>config_file</replaceable>
  49               </option>
  50       </arg>
  51       <arg>
  52                 <option>-t=</option>
  53                 <arg choice='plain'>
  54                         <replaceable>target_release</replaceable>
  55                 </arg>
  56       </arg>
  57       <arg>
  58                 <option>-a=</option>
  59                 <arg choice='plain'>
  60                         <replaceable>default_architecture</replaceable>
  61                 </arg>
  62       </arg>
  63
  64
  65       <group choice="req">
  66          <arg choice='plain'>update</arg>
  67          <arg choice='plain'>upgrade</arg>
  68          <arg choice='plain'>dselect-upgrade</arg>
  69          <arg choice='plain'>dist-upgrade</arg>
  70          <arg choice='plain'>install
  71                          <arg choice="plain" rep="repeat"><replaceable>pkg</replaceable>
  72                                 <arg>
  73                                         <group choice='req'>
  74                                                 <arg choice='plain'>
  75                                                         =<replaceable>pkg_version_number</replaceable>
  76                                                 </arg>
  77                                                 <arg choice='plain'>
  78                                                         /<replaceable>target_release</replaceable>
  79                                                 </arg>
  80                                         </group>
  81                                 </arg>
  82                          </arg>
  83              </arg>
  84          <arg choice='plain'>remove <arg choice="plain" rep="repeat"><replaceable>pkg</replaceable></arg></arg>
  85          <arg choice='plain'>purge <arg choice="plain" rep="repeat"><replaceable>pkg</replaceable></arg></arg>
  86          <arg choice='plain'>source
  87                          <arg choice="plain" rep="repeat"><replaceable>pkg</replaceable>
  88                                 <arg>
  89                                         <group choice='req'>
  90                                                 <arg choice='plain'>
  91                                                         =<replaceable>pkg_version_number</replaceable>
  92                                                 </arg>
  93                                                 <arg choice='plain'>
  94                                                         /<replaceable>target_release</replaceable>
  95                                                 </arg>
  96                                         </group>
  97                                 </arg>
  98                          </arg>
  99              </arg>
 100          <arg choice='plain'>build-dep <arg choice="plain" rep="repeat"><replaceable>pkg</replaceable></arg></arg>
 101          <arg choice='plain'>check</arg>
 102          <arg choice='plain'>clean</arg>
 103          <arg choice='plain'>autoclean</arg>
 104          <arg choice='plain'>autoremove</arg>
 105                  <arg choice='plain'>
 106                          <group choice='req'>
 107                                 <arg choice='plain'>-v</arg>
 108                                 <arg choice='plain'>--version</arg>
 109                          </group>
 110                  </arg>
 111                  <arg choice='plain'>
 112                          <group choice='req'>
 113                                 <arg choice='plain'>-h</arg>
 114                                 <arg choice='plain'>--help</arg>
 115                          </group>
 116                  </arg>
 117       </group>
 118    </cmdsynopsis>
 119  </refsynopsisdiv>
 120
 121  <refsect1><title>Description</title>
 122    <para><command>apt-get</command> is the command-line tool for handling packages, and may be
 123    considered the user's "back-end" to other tools using the APT
 124    library.  Several "front-end" interfaces exist, such as &dselect;,
 125    &aptitude;, &synaptic; and &wajig;.</para>
 126
 127    <para>Unless the <option>-h</option>, or <option>--help</option> option is given, one of the
 128    commands below must be present.</para>
 129
 130    <variablelist>
 131      <varlistentry><term>update</term>
 132      <listitem><para><literal>update</literal> is used to resynchronize the package index files from
 133      their sources. The indexes of available packages are fetched from the
 134      location(s) specified in <filename>/etc/apt/sources.list</filename>.
 135      For example, when using a Debian archive, this command retrieves and
 136      scans the <filename>Packages.gz</filename> files, so that information about new
 137      and updated packages is available. An <literal>update</literal> should always be
 138      performed before an <literal>upgrade</literal> or <literal>dist-upgrade</literal>. Please
 139      be aware that the overall progress meter will be incorrect as the size
 140      of the package files cannot be known in advance.</para></listitem>
 141      </varlistentry>
 142
 143      <varlistentry><term>upgrade</term>
 144      <listitem><para><literal>upgrade</literal> is used to install the newest versions of all packages
 145      currently installed on the system from the sources enumerated in
 146      <filename>/etc/apt/sources.list</filename>. Packages currently installed with
 147      new versions available are retrieved and upgraded; under no circumstances
 148      are currently installed packages removed, or packages not already installed
 149      retrieved and installed. New versions of currently installed packages that
 150      cannot be upgraded without changing the install status of another package
 151      will be left at their current version. An <literal>update</literal> must be
 152      performed first so that <command>apt-get</command> knows that new versions of packages are
 153      available.</para></listitem>
 154      </varlistentry>
 155
 156      <varlistentry><term>dselect-upgrade</term>
 157      <listitem><para><literal>dselect-upgrade</literal>
 158      is used in conjunction with the traditional Debian packaging
 159      front-end, &dselect;. <literal>dselect-upgrade</literal>
 160      follows the changes made by &dselect; to the <literal>Status</literal>
 161      field of available packages, and performs the actions necessary to realize
 162      that state (for instance, the removal of old and the installation of new
 163      packages).</para></listitem>
 164      </varlistentry>
 165
 166      <varlistentry><term>dist-upgrade</term>
 167      <listitem><para><literal>dist-upgrade</literal> in addition to performing the function of
 168      <literal>upgrade</literal>, also intelligently handles changing dependencies
 169      with new versions of packages; <command>apt-get</command> has a "smart" conflict
 170      resolution system, and it will attempt to upgrade the most important
 171      packages at the expense of less important ones if necessary.
 172          So, <literal>dist-upgrade</literal> command may remove some packages.
 173      The <filename>/etc/apt/sources.list</filename> file contains a list of locations
 174      from which to retrieve desired package files.
 175      See also &apt-preferences; for a mechanism for
 176      overriding the general settings for individual packages.</para></listitem>
 177      </varlistentry>
 178
 179      <varlistentry><term>install</term>
 180      <listitem>
 181          <para><literal>install</literal> is followed by one or more
 182          packages desired for installation or upgrading.
 183          Each package is a package name, not a fully qualified
 184          filename (for instance, in a Debian GNU/Linux system,
 185          libc6 would be the argument provided, not
 186          <literal>libc6_1.9.6-2.deb</literal>). All packages required
 187          by the package(s) specified for installation will also
 188          be retrieved and installed.
 189          The <filename>/etc/apt/sources.list</filename> file is
 190          used to locate the desired packages. If a hyphen is
 191          appended to the package name (with no intervening space),
 192          the identified package will be removed if it is installed.
 193          Similarly a plus sign can be used to designate a
 194          package to install. These latter features may be used
 195          to override decisions made by apt-get's conflict
 196          resolution system.
 197          </para>
 198
 199      <para>A specific version of a package can be selected for installation by
 200      following the package name with an equals and the version of the package
 201      to select. This will cause that version to be located and selected for
 202      install. Alternatively a specific distribution can be selected by
 203      following the package name with a slash and the version of the
 204      distribution or the Archive name (stable, testing, unstable).</para>
 205
 206      <para>Both of the version selection mechanisms can downgrade packages and must
 207      be used with care.</para>
 208
 209         <para>This is also the target to use if you want to upgrade one or
 210                 more already-installed packages without upgrading every package
 211                 you have on your system. Unlike the "upgrade" target, which
 212                 installs the newest version of all currently installed packages,
 213                 "install" will install the newest version of only the package(s)
 214                 specified. Simply provide the name of the package(s) you wish
 215                 to upgrade, and if a newer version is available, it (and its
 216                 dependencies, as described above) will be downloaded and
 217                 installed.
 218         </para>
 219
 220      <para>Finally, the &apt-preferences; mechanism allows you to
 221      create an alternative installation policy for
 222      individual packages.</para>
 223
 224      <para>If no package matches the given expression and the expression contains one
 225      of '.', '?' or '*' then it is assumed to be a POSIX regular expression,
 226      and it is applied
 227      to all package names in the database. Any matches are then installed (or
 228      removed). Note that matching is done by substring so 'lo.*' matches 'how-lo'
 229      and 'lowest'. If this is undesired, anchor the regular expression
 230      with a '^' or '$' character, or create a more specific regular expression.</para></listitem>
 231      </varlistentry>
 232
 233      <varlistentry><term>remove</term>
 234      <listitem><para><literal>remove</literal> is identical to <literal>install</literal> except that packages are
 235          removed instead of installed. Note the removing a package leaves its
 236          configuration files in system. If a plus sign is appended to the package
 237      name (with no intervening space), the identified package will be
 238      installed instead of removed.</para></listitem>
 239      </varlistentry>
 240
 241      <varlistentry><term>purge</term>
 242      <listitem><para><literal>purge</literal> is identical to <literal>remove</literal> except that packages are
 243      removed and purged (any configuration files are deleted too).</para></listitem>
 244      </varlistentry>
 245
 246      <varlistentry><term>source</term>
 247      <listitem><para><literal>source</literal> causes <command>apt-get</command> to fetch source packages. APT
 248      will examine the available packages to decide which source package to
 249      fetch. It will then find and download into the current directory the
 250      newest available version of that source package while respect the
 251      default release, set with the option <literal>APT::Default-Release</literal>,
 252      the <option>-t</option> option or per package with the
 253      <literal>pkg/release</literal> syntax, if possible.</para>
 254
 255      <para>Source packages are tracked separately
 256      from binary packages via <literal>deb-src</literal> type lines
 257      in the &sources-list; file. This means that you will need to add such a line
 258      for each repository you want to get sources from. If you don't do this
 259      you will properly get another (newer, older or none) source version than
 260      the one you have installed or could install.</para>
 261
 262      <para>If the <option>--compile</option> option is specified
 263      then the package will be compiled to a binary .deb using
 264      <command>dpkg-buildpackage</command> for the architecture as
 265      defined by the <command>--host-architecture</command> option.
 266      If <option>--download-only</option> is specified then the source package
 267      will not be unpacked.</para>
 268
 269      <para>A specific source version can be retrieved by postfixing the source name
 270      with an equals and then the version to fetch, similar to the mechanism
 271      used for the package files. This enables exact matching of the source
 272      package name and version, implicitly enabling the
 273      <literal>APT::Get::Only-Source</literal> option.</para>
 274
 275      <para>Note that source packages are not tracked like binary packages, they
 276      exist only in the current directory and are similar to downloading source
 277      tar balls.</para></listitem>
 278      </varlistentry>
 279
 280      <varlistentry><term>build-dep</term>
 281      <listitem><para><literal>build-dep</literal> causes apt-get to install/remove packages in an
 282      attempt to satisfy the build dependencies for a source package. By default the dependencies are
 283      satisfied to build the package nativly. If desired a host-architecture can be specified
 284      with the <option>--host-architecture</option> option instead.</para></listitem>
 285      </varlistentry>
 286
 287      <varlistentry><term>check</term>
 288      <listitem><para><literal>check</literal> is a diagnostic tool; it updates the package cache and checks
 289      for broken dependencies.</para></listitem>
 290      </varlistentry>
 291
 292      <varlistentry><term>download</term>
 293        <listitem><para><literal>download</literal> will download the given
 294            binary package into the current directory.
 295        </para></listitem>
 296      </varlistentry>
 297
 298      <varlistentry><term>clean</term>
 299      <listitem><para><literal>clean</literal> clears out the local repository of retrieved package
 300      files. It removes everything but the lock file from
 301      <filename>&cachedir;/archives/</filename> and
 302      <filename>&cachedir;/archives/partial/</filename>. When APT is used as a
 303      &dselect; method, <literal>clean</literal> is run automatically.
 304      Those who do not use dselect will likely want to run <literal>apt-get clean</literal>
 305      from time to time to free up disk space.</para></listitem>
 306      </varlistentry>
 307
 308      <varlistentry><term>autoclean</term>
 309      <listitem><para>Like <literal>clean</literal>, <literal>autoclean</literal> clears out the local
 310      repository of retrieved package files. The difference is that it only
 311      removes package files that can no longer be downloaded, and are largely
 312      useless. This allows a cache to be maintained over a long period without
 313      it growing out of control. The configuration option
 314      <literal>APT::Clean-Installed</literal> will prevent installed packages from being
 315      erased if it is set to off.</para></listitem>
 316      </varlistentry>
 317
 318      <varlistentry><term>autoremove</term>
 319      <listitem><para><literal>autoremove</literal> is used to remove packages that were automatically
 320      installed to satisfy dependencies for other packages and are now no longer needed.</para></listitem>
 321      </varlistentry>
 322
 323      <varlistentry><term>changelog</term>
 324        <listitem><para><literal>changelog</literal> downloads a package changelog and displays
 325            it through <command>sensible-pager</command>. The server name and base
 326            directory is defined in the <literal>APT::Changelogs::Server</literal>
 327            variable (e. g. <ulink>http://packages.debian.org/changelogs</ulink> for
 328            Debian or <ulink>http://changelogs.ubuntu.com/changelogs</ulink> for
 329            Ubuntu).
 330            By default it displays the changelog for the version that is
 331            installed.  However, you can specify the same options as for
 332            the <option>install</option> command.
 333          </para>
 334        </listitem>
 335      </varlistentry>
 336
 337
 338
 339    </variablelist>
 340  </refsect1>
 341
 342  <refsect1><title>options</title>
 343    &apt-cmdblurb;
 344
 345    <variablelist>
 346      <varlistentry><term><option>--no-install-recommends</option></term>
 347      <listitem><para>Do not consider recommended packages as a dependency for installing.
 348      Configuration Item: <literal>APT::Install-Recommends</literal>.</para></listitem>
 349      </varlistentry>
 350
 351      <varlistentry><term><option>--install-suggests</option></term>
 352      <listitem><para>Consider suggested packages as a dependency for installing.
 353      Configuration Item: <literal>APT::Install-Suggests</literal>.</para></listitem>
 354      </varlistentry>
 355
 356      <varlistentry><term><option>-d</option></term><term><option>--download-only</option></term>
 357      <listitem><para>Download only; package files are only retrieved, not unpacked or installed.
 358      Configuration Item: <literal>APT::Get::Download-Only</literal>.</para></listitem>
 359      </varlistentry>
 360
 361      <varlistentry><term><option>-f</option></term><term><option>--fix-broken</option></term>
 362      <listitem><para>Fix; attempt to correct a system with broken dependencies in
 363      place. This option, when used with install/remove, can omit any packages
 364      to permit APT to deduce a likely solution. If packages are specified,
 365      these have to completely correct the problem. The option is sometimes necessary when
 366      running APT for the first time; APT itself does not allow broken package
 367      dependencies to exist on a system. It is possible that a system's
 368      dependency structure can be so corrupt as to require manual intervention
 369      (which usually means using &dselect; or <command>dpkg --remove</command> to eliminate some of
 370      the offending packages). Use of this option together with <option>-m</option> may produce an
 371      error in some situations.
 372      Configuration Item: <literal>APT::Get::Fix-Broken</literal>.</para></listitem>
 373      </varlistentry>
 374
 375      <varlistentry><term><option>-m</option></term><term><option>--ignore-missing</option></term>
 376      <term><option>--fix-missing</option></term>
 377      <listitem><para>Ignore missing packages; If packages cannot be retrieved or fail the
 378      integrity check after retrieval (corrupted package files), hold back
 379      those packages and handle the result. Use of this option together with
 380      <option>-f</option> may produce an error in some situations. If a package is
 381      selected for installation (particularly if it is mentioned on the
 382      command line) and it could not be downloaded then it will be silently
 383      held back.
 384      Configuration Item: <literal>APT::Get::Fix-Missing</literal>.</para></listitem>
 385      </varlistentry>
 386
 387      <varlistentry><term><option>--no-download</option></term>
 388      <listitem><para>Disables downloading of packages. This is best used with
 389      <option>--ignore-missing</option> to force APT to use only the .debs it has
 390      already downloaded.
 391      Configuration Item: <literal>APT::Get::Download</literal>.</para></listitem>
 392      </varlistentry>
 393
 394      <varlistentry><term><option>-q</option></term><term><option>--quiet</option></term>
 395      <listitem><para>Quiet; produces output suitable for logging, omitting progress indicators.
 396      More q's will produce more quiet up to a maximum of 2. You can also use
 397      <option>-q=#</option> to set the quiet level, overriding the configuration file.
 398      Note that quiet level 2 implies <option>-y</option>, you should never use -qq
 399      without a no-action modifier such as -d, --print-uris or -s as APT may
 400      decided to do something you did not expect.
 401      Configuration Item: <literal>quiet</literal>.</para></listitem>
 402      </varlistentry>
 403
 404      <varlistentry><term><option>-s</option></term>
 405                    <term><option>--simulate</option></term>
 406                    <term><option>--just-print</option></term>
 407                    <term><option>--dry-run</option></term>
 408                    <term><option>--recon</option></term>
 409                    <term><option>--no-act</option></term>
 410      <listitem><para>No action; perform a simulation of events that would occur but do not
 411      actually change the system.
 412      Configuration Item: <literal>APT::Get::Simulate</literal>.</para>
 413
 414      <para>Simulation run as user will deactivate locking (<literal>Debug::NoLocking</literal>)
 415      automatic. Also a notice will be displayed indicating that this is only a simulation,
 416      if the option <literal>APT::Get::Show-User-Simulation-Note</literal> is set (Default: true).
 417      Neither NoLocking nor the notice will be triggered if run as root (root should know what
 418      he is doing without further warnings by <literal>apt-get</literal>).</para>
 419
 420      <para>Simulate prints out
 421      a series of lines each one representing a dpkg operation, Configure (Conf),
 422      Remove (Remv), Unpack (Inst). Square brackets indicate broken packages
 423      and empty set of square brackets meaning breaks that are of no consequence
 424      (rare).</para></listitem>
 425      </varlistentry>
 426
 427      <varlistentry><term><option>-y</option></term><term><option>--yes</option></term>
 428                    <term><option>--assume-yes</option></term>
 429      <listitem><para>Automatic yes to prompts; assume "yes" as answer to all prompts and run
 430      non-interactively. If an undesirable situation, such as changing a held
 431      package, trying to install a unauthenticated package or removing an essential package
 432      occurs then <literal>apt-get</literal> will abort.
 433      Configuration Item: <literal>APT::Get::Assume-Yes</literal>.</para></listitem>
 434      </varlistentry>
 435
 436      <varlistentry><term><option>--assume-no</option></term>
 437      <listitem><para>Automatic "no" to all prompts.
 438      Configuration Item: <literal>APT::Get::Assume-No</literal>.</para></listitem>
 439      </varlistentry>
 440
 441      <varlistentry><term><option>-u</option></term><term><option>--show-upgraded</option></term>
 442      <listitem><para>Show upgraded packages; Print out a list of all packages that are to be
 443      upgraded.
 444      Configuration Item: <literal>APT::Get::Show-Upgraded</literal>.</para></listitem>
 445      </varlistentry>
 446
 447      <varlistentry><term><option>-V</option></term><term><option>--verbose-versions</option></term>
 448      <listitem><para>Show full versions for upgraded and installed packages.
 449      Configuration Item: <literal>APT::Get::Show-Versions</literal>.</para></listitem>
 450      </varlistentry>
 451
 452      <varlistentry><term><option>-a</option></term>
 453                    <term><option>--host-architecture</option></term>
 454      <listitem><para>This option controls the architecture packages are built for
 455      by <command>apt-get source --compile</command> and how cross-builddependencies
 456      are satisfied. By default is not set which means that the host architecture
 457      is the same as the build architecture (which is defined by <literal>APT::Architecture</literal>)
 458      Configuration Item: <literal>APT::Get::Host-Architecture</literal>
 459      </para></listitem>
 460      </varlistentry>
 461
 462      <varlistentry><term><option>-b</option></term><term><option>--compile</option></term>
 463                    <term><option>--build</option></term>
 464      <listitem><para>Compile source packages after downloading them.
 465      Configuration Item: <literal>APT::Get::Compile</literal>.</para></listitem>
 466      </varlistentry>
 467
 468      <varlistentry><term><option>--ignore-hold</option></term>
 469      <listitem><para>Ignore package Holds; This causes <command>apt-get</command> to ignore a hold
 470      placed on a package. This may be useful in conjunction with
 471      <literal>dist-upgrade</literal> to override a large number of undesired holds.
 472      Configuration Item: <literal>APT::Ignore-Hold</literal>.</para></listitem>
 473      </varlistentry>
 474
 475      <varlistentry><term><option>--no-upgrade</option></term>
 476      <listitem><para>Do not upgrade packages; When used in conjunction with <literal>install</literal>,
 477      <literal>no-upgrade</literal> will prevent packages on the command line
 478      from being upgraded if they are already installed.
 479      Configuration Item: <literal>APT::Get::Upgrade</literal>.</para></listitem>
 480      </varlistentry>
 481
 482      <varlistentry><term><option>--only-upgrade</option></term>
 483      <listitem><para>Do not install new packages; When used in conjunction with <literal>install</literal>,
 484      <literal>only-upgrade</literal> will prevent packages on the command line
 485      from being upgraded if they are not already installed.
 486      Configuration Item: <literal>APT::Get::Only-Upgrade</literal>.</para></listitem>
 487      </varlistentry>
 488
 489      <varlistentry><term><option>--force-yes</option></term>
 490      <listitem><para>Force yes; This is a dangerous option that will cause apt to continue
 491      without prompting if it is doing something potentially harmful. It
 492      should not be used except in very special situations. Using
 493      <literal>force-yes</literal> can potentially destroy your system!
 494      Configuration Item: <literal>APT::Get::force-yes</literal>.</para></listitem>
 495      </varlistentry>
 496
 497      <varlistentry><term><option>--print-uris</option></term>
 498      <listitem><para>Instead of fetching the files to install their URIs are printed. Each
 499      URI will have the path, the destination file name, the size and the expected
 500      md5 hash. Note that the file name to write to will not always match
 501      the file name on the remote site! This also works with the
 502      <literal>source</literal> and <literal>update</literal> commands. When used with the
 503      <literal>update</literal> command the MD5 and size are not included, and it is
 504      up to the user to decompress any compressed files.
 505      Configuration Item: <literal>APT::Get::Print-URIs</literal>.</para></listitem>
 506      </varlistentry>
 507
 508      <varlistentry><term><option>--purge</option></term>
 509      <listitem><para>Use purge instead of remove for anything that would be removed.
 510      An asterisk ("*") will be displayed next to packages which are
 511          scheduled to be purged. <option>remove --purge</option> is equivalent to the
 512          <option>purge</option> command.
 513      Configuration Item: <literal>APT::Get::Purge</literal>.</para></listitem>
 514      </varlistentry>
 515
 516      <varlistentry><term><option>--reinstall</option></term>
 517      <listitem><para>Re-Install packages that are already installed and at the newest version.
 518      Configuration Item: <literal>APT::Get::ReInstall</literal>.</para></listitem>
 519      </varlistentry>
 520
 521      <varlistentry><term><option>--list-cleanup</option></term>
 522      <listitem><para>This option defaults to on, use <literal>--no-list-cleanup</literal> to turn it
 523      off. When on <command>apt-get</command> will automatically manage the contents of
 524      <filename>&statedir;/lists</filename> to ensure that obsolete files are erased.
 525      The only  reason to turn it off is if you frequently change your source
 526      list.
 527      Configuration Item: <literal>APT::Get::List-Cleanup</literal>.</para></listitem>
 528      </varlistentry>
 529
 530      <varlistentry><term><option>-t</option></term>
 531                    <term><option>--target-release</option></term>
 532                    <term><option>--default-release</option></term>
 533      <listitem><para>This option controls the default input to the policy engine, it creates
 534      a default pin at priority 990 using the specified release string.
 535      This overrides the general settings in <filename>/etc/apt/preferences</filename>.
 536      Specifically pinned packages are not affected by the value
 537      of this option. In short, this option
 538      lets you have simple control over which distribution packages will be
 539      retrieved from. Some common examples might be
 540      <option>-t '2.1*'</option>, <option>-t unstable</option>
 541      or <option>-t sid</option>.
 542      Configuration Item: <literal>APT::Default-Release</literal>;
 543      see also the &apt-preferences; manual page.</para></listitem>
 544      </varlistentry>
 545
 546      <varlistentry><term><option>--trivial-only</option></term>
 547      <listitem><para>
 548      Only perform operations that are 'trivial'. Logically this can be considered
 549      related to <option>--assume-yes</option>, where <option>--assume-yes</option> will answer
 550      yes to any prompt, <option>--trivial-only</option> will answer no.
 551      Configuration Item: <literal>APT::Get::Trivial-Only</literal>.</para></listitem>
 552      </varlistentry>
 553
 554      <varlistentry><term><option>--no-remove</option></term>
 555      <listitem><para>If any packages are to be removed apt-get immediately aborts without
 556      prompting.
 557      Configuration Item: <literal>APT::Get::Remove</literal>.</para></listitem>
 558      </varlistentry>
 559
 560      <varlistentry><term><option>--auto-remove</option></term>
 561      <listitem><para>If the command is either <literal>install</literal> or <literal>remove</literal>,
 562      then this option acts like running <literal>autoremove</literal> command, removing the unused
 563      dependency packages. Configuration Item: <literal>APT::Get::AutomaticRemove</literal>.
 564      </para></listitem>
 565      </varlistentry>
 566
 567      <varlistentry><term><option>--only-source</option></term>
 568      <listitem><para>Only has meaning for the
 569      <literal>source</literal> and <literal>build-dep</literal>
 570      commands.  Indicates that the given source names are not to be
 571      mapped through the binary table.  This means that if this option
 572      is specified, these commands will only accept source package
 573      names as arguments, rather than accepting binary package names
 574      and looking up the corresponding source package.  Configuration
 575      Item: <literal>APT::Get::Only-Source</literal>.</para></listitem>
 576      </varlistentry>
 577
 578      <varlistentry><term><option>--diff-only</option></term><term><option>--dsc-only</option></term><term><option>--tar-only</option></term>
 579      <listitem><para>Download only the diff, dsc, or tar file of a source archive.
 580      Configuration Item: <literal>APT::Get::Diff-Only</literal>, <literal>APT::Get::Dsc-Only</literal>, and
 581      <literal>APT::Get::Tar-Only</literal>.</para></listitem>
 582      </varlistentry>
 583
 584      <varlistentry><term><option>--arch-only</option></term>
 585      <listitem><para>Only process architecture-dependent build-dependencies.
 586      Configuration Item: <literal>APT::Get::Arch-Only</literal>.</para></listitem>
 587      </varlistentry>
 588
 589      <varlistentry><term><option>--allow-unauthenticated</option></term>
 590      <listitem><para>Ignore if packages can't be authenticated and don't prompt about it.
 591      This is useful for tools like pbuilder.
 592      Configuration Item: <literal>APT::Get::AllowUnauthenticated</literal>.</para></listitem>
 593      </varlistentry>
 594
 595
 596      &apt-commonoptions;
 597
 598    </variablelist>
 599  </refsect1>
 600
 601  <refsect1><title>Files</title>
 602    <variablelist>
 603      &file-sourceslist;
 604      &file-aptconf;
 605      &file-preferences;
 606      &file-cachearchives;
 607      &file-statelists;
 608    </variablelist>
 609  </refsect1>
 610
 611  <refsect1><title>See Also</title>
 612    <para>&apt-cache;, &apt-cdrom;, &dpkg;, &dselect;, &sources-list;,
 613    &apt-conf;, &apt-config;, &apt-secure;,
 614    The APT User's guide in &guidesdir;, &apt-preferences;, the APT Howto.</para>
 615  </refsect1>
 616
 617  <refsect1><title>Diagnostics</title>
 618    <para><command>apt-get</command> returns zero on normal operation, decimal 100 on error.</para>
 619  </refsect1>
 620  <refsect1>
 621          <title>ORIGINAL AUTHORS</title>
 622          <para>&apt-author.jgunthorpe;</para>
 623  </refsect1>
 624  <refsect1>
 625          <title>CURRENT AUTHORS</title>
 626          <para>
 627                  &apt-author.team;
 628          </para>
 629                  &apt-qapage;
 630  </refsect1>
 631  &manbugs;
 632 </refentry>