doc/apt-get.8.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
   4 <!ENTITY % aptent SYSTEM "apt.ent"> %aptent;
   5 <!ENTITY % aptverbatiment SYSTEM "apt-verbatim.ent"> %aptverbatiment;
   6 <!ENTITY % aptvendor SYSTEM "apt-vendor.ent"> %aptvendor;
   7 ]>
   8
   9 <refentry>
  10
  11  <refentryinfo>
  12    &apt-author.jgunthorpe;
  13    &apt-author.team;
  14    &apt-email;
  15    &apt-product;
  16    <!-- The last update date -->
  17    <date>2012-06-09T00:00:00Z</date>
  18  </refentryinfo>
  19
  20  <refmeta>
  21    <refentrytitle>apt-get</refentrytitle>
  22    <manvolnum>8</manvolnum>
  23    <refmiscinfo class="manual">APT</refmiscinfo>
  24  </refmeta>
  25
  26  <!-- Man page title -->
  27  <refnamediv>
  28     <refname>apt-get</refname>
  29     <refpurpose>APT package handling utility -- command-line interface</refpurpose>
  30  </refnamediv>
  31
  32  &synopsis-command-apt-get;
  33
  34  <refsect1><title>Description</title>
  35    <para><command>apt-get</command> is the command-line tool for handling packages, and may be
  36    considered the user's "back-end" to other tools using the APT
  37    library.  Several "front-end" interfaces exist, such as
  38    &aptitude;, &synaptic; and &wajig;.</para>
  39
  40    <para>Unless the <option>-h</option>, or <option>--help</option> option is given, one of the
  41    commands below must be present.</para>
  42
  43    <variablelist>
  44      <varlistentry><term><option>update</option></term>
  45      <listitem><para><literal>update</literal> is used to resynchronize the package index files from
  46      their sources. The indexes of available packages are fetched from the
  47      location(s) specified in <filename>/etc/apt/sources.list</filename>.
  48      For example, when using a Debian archive, this command retrieves and
  49      scans the <filename>Packages.gz</filename> files, so that information about new
  50      and updated packages is available. An <literal>update</literal> should always be
  51      performed before an <literal>upgrade</literal> or <literal>dist-upgrade</literal>. Please
  52      be aware that the overall progress meter will be incorrect as the size
  53      of the package files cannot be known in advance.</para></listitem>
  54      </varlistentry>
  55
  56      <varlistentry><term><option>upgrade</option></term>
  57      <listitem><para><literal>upgrade</literal> is used to install the newest versions of all packages
  58      currently installed on the system from the sources enumerated in
  59      <filename>/etc/apt/sources.list</filename>. Packages currently installed with
  60      new versions available are retrieved and upgraded; under no circumstances
  61      are currently installed packages removed, or packages not already installed
  62      retrieved and installed. New versions of currently installed packages that
  63      cannot be upgraded without changing the install status of another package
  64      will be left at their current version. An <literal>update</literal> must be
  65      performed first so that <command>apt-get</command> knows that new versions of packages are
  66      available.</para></listitem>
  67      </varlistentry>
  68
  69      <varlistentry><term><option>dist-upgrade</option></term>
  70      <listitem><para><literal>dist-upgrade</literal> in addition to performing the function of
  71      <literal>upgrade</literal>, also intelligently handles changing dependencies
  72      with new versions of packages; <command>apt-get</command> has a "smart" conflict
  73      resolution system, and it will attempt to upgrade the most important
  74      packages at the expense of less important ones if necessary.
  75      The <literal>dist-upgrade</literal> command may therefore remove some packages.
  76      The <filename>/etc/apt/sources.list</filename> file contains a list of locations
  77      from which to retrieve desired package files.
  78      See also &apt-preferences; for a mechanism for
  79      overriding the general settings for individual packages.</para></listitem>
  80      </varlistentry>
  81
  82      <varlistentry><term><option>dselect-upgrade</option></term>
  83      <listitem><para><literal>dselect-upgrade</literal>
  84      is used in conjunction with the traditional Debian packaging
  85      front-end, &dselect;. <literal>dselect-upgrade</literal>
  86      follows the changes made by &dselect; to the <literal>Status</literal>
  87      field of available packages, and performs the actions necessary to realize
  88      that state (for instance, the removal of old and the installation of new
  89      packages).</para></listitem>
  90      </varlistentry>
  91
  92      <varlistentry><term><option>install</option></term>
  93      <listitem>
  94          <para><literal>install</literal> is followed by one or more
  95          packages desired for installation or upgrading.
  96          Each package is a package name, not a fully qualified
  97          filename (for instance, in a Debian system,
  98          <package>apt-utils</package> would be the argument provided, not
  99          <filename>apt-utils_&apt-product-version;_amd64.deb</filename>). All packages required
 100          by the package(s) specified for installation will also
 101          be retrieved and installed.
 102          The <filename>/etc/apt/sources.list</filename> file is
 103          used to locate the desired packages. If a hyphen is
 104          appended to the package name (with no intervening space),
 105          the identified package will be removed if it is installed.
 106          Similarly a plus sign can be used to designate a
 107          package to install. These latter features may be used
 108          to override decisions made by apt-get's conflict
 109          resolution system.
 110          </para>
 111
 112      <para>A specific version of a package can be selected for installation by
 113      following the package name with an equals and the version of the package
 114      to select. This will cause that version to be located and selected for
 115      install. Alternatively a specific distribution can be selected by
 116      following the package name with a slash and the version of the
 117      distribution or the Archive name (stable, testing, unstable).</para>
 118
 119      <para>Both of the version selection mechanisms can downgrade packages and must
 120      be used with care.</para>
 121
 122         <para>This is also the target to use if you want to upgrade one or
 123                 more already-installed packages without upgrading every package
 124                 you have on your system. Unlike the "upgrade" target, which
 125                 installs the newest version of all currently installed packages,
 126                 "install" will install the newest version of only the package(s)
 127                 specified. Simply provide the name of the package(s) you wish
 128                 to upgrade, and if a newer version is available, it (and its
 129                 dependencies, as described above) will be downloaded and
 130                 installed.
 131         </para>
 132
 133      <para>Finally, the &apt-preferences; mechanism allows you to
 134      create an alternative installation policy for
 135      individual packages.</para>
 136
 137      <para>If no package matches the given expression and the expression contains one
 138      of '.', '?' or '*' then it is assumed to be a POSIX regular expression,
 139      and it is applied
 140      to all package names in the database. Any matches are then installed (or
 141      removed). Note that matching is done by substring so 'lo.*' matches 'how-lo'
 142      and 'lowest'. If this is undesired, anchor the regular expression
 143      with a '^' or '$' character, or create a more specific regular expression.</para></listitem>
 144      </varlistentry>
 145
 146      <varlistentry><term><option>remove</option></term>
 147      <listitem><para><literal>remove</literal> is identical to <literal>install</literal> except that packages are
 148          removed instead of installed. Note that removing a package leaves its
 149          configuration files on the system. If a plus sign is appended to the package
 150      name (with no intervening space), the identified package will be
 151      installed instead of removed.</para></listitem>
 152      </varlistentry>
 153
 154      <varlistentry><term><option>purge</option></term>
 155      <listitem><para><literal>purge</literal> is identical to <literal>remove</literal> except that packages are
 156      removed and purged (any configuration files are deleted too).</para></listitem>
 157      </varlistentry>
 158
 159      <varlistentry><term><option>source</option></term>
 160      <listitem><para><literal>source</literal> causes <command>apt-get</command> to fetch source packages. APT
 161      will examine the available packages to decide which source package to
 162      fetch. It will then find and download into the current directory the
 163      newest available version of that source package while respecting the
 164      default release, set with the option <literal>APT::Default-Release</literal>,
 165      the <option>-t</option> option or per package with the
 166      <literal>pkg/release</literal> syntax, if possible.</para>
 167
 168      <para>Source packages are tracked separately
 169      from binary packages via <literal>deb-src</literal> lines
 170      in the &sources-list; file. This means that you will need to add such a line
 171      for each repository you want to get sources from; otherwise you will probably
 172      get either the wrong (too old/too new) source versions or none at all.</para>
 173
 174      <para>If the <option>--compile</option> option is specified
 175      then the package will be compiled to a binary .deb using
 176      <command>dpkg-buildpackage</command> for the architecture as
 177      defined by the <command>--host-architecture</command> option.
 178      If <option>--download-only</option> is specified then the source package
 179      will not be unpacked.</para>
 180
 181      <para>A specific source version can be retrieved by postfixing the source name
 182      with an equals and then the version to fetch, similar to the mechanism
 183      used for the package files. This enables exact matching of the source
 184      package name and version, implicitly enabling the
 185      <literal>APT::Get::Only-Source</literal> option.</para>
 186
 187      <para>Note that source packages are not installed and tracked in the
 188      <command>dpkg</command> database like binary packages; they are simply downloaded
 189      to the current directory, like source tarballs.</para></listitem>
 190      </varlistentry>
 191
 192      <varlistentry><term><option>build-dep</option></term>
 193      <listitem><para><literal>build-dep</literal> causes apt-get to install/remove packages in an
 194      attempt to satisfy the build dependencies for a source package. By default the dependencies are
 195      satisfied to build the package natively. If desired a host-architecture can be specified
 196      with the <option>--host-architecture</option> option instead.</para></listitem>
 197      </varlistentry>
 198
 199      <varlistentry><term><option>check</option></term>
 200      <listitem><para><literal>check</literal> is a diagnostic tool; it updates the package cache and checks
 201      for broken dependencies.</para></listitem>
 202      </varlistentry>
 203
 204      <varlistentry><term><option>download</option></term>
 205        <listitem><para><literal>download</literal> will download the given
 206            binary package into the current directory.
 207        </para></listitem>
 208      </varlistentry>
 209
 210      <varlistentry><term><option>clean</option></term>
 211      <listitem><para><literal>clean</literal> clears out the local repository of retrieved package
 212      files. It removes everything but the lock file from
 213      <filename>&cachedir;/archives/</filename> and
 214      <filename>&cachedir;/archives/partial/</filename>.</para></listitem>
 215      </varlistentry>
 216
 217      <varlistentry><term><option>autoclean</option></term>
 218      <listitem><para>Like <literal>clean</literal>, <literal>autoclean</literal> clears out the local
 219      repository of retrieved package files. The difference is that it only
 220      removes package files that can no longer be downloaded, and are largely
 221      useless. This allows a cache to be maintained over a long period without
 222      it growing out of control. The configuration option
 223      <literal>APT::Clean-Installed</literal> will prevent installed packages from being
 224      erased if it is set to off.</para></listitem>
 225      </varlistentry>
 226
 227      <varlistentry><term><option>autoremove</option></term>
 228      <listitem><para><literal>autoremove</literal> is used to remove packages that were automatically
 229      installed to satisfy dependencies for other packages and are now no longer needed.</para></listitem>
 230      </varlistentry>
 231
 232      <varlistentry><term><option>changelog</option></term>
 233        <listitem><para><literal>changelog</literal> downloads a package changelog and displays
 234            it through <command>sensible-pager</command>. The server name and base
 235            directory is defined in the <literal>APT::Changelogs::Server</literal>
 236            variable (e.g. <ulink url="http://packages.debian.org/changelogs">packages.debian.org/changelogs</ulink> for
 237            Debian or <ulink url="http://changelogs.ubuntu.com/changelogs">changelogs.ubuntu.com/changelogs</ulink> for
 238            Ubuntu).
 239            By default it displays the changelog for the version that is
 240            installed.  However, you can specify the same options as for
 241            the <option>install</option> command.
 242          </para>
 243        </listitem>
 244      </varlistentry>
 245
 246
 247
 248    </variablelist>
 249  </refsect1>
 250
 251  <refsect1><title>options</title>
 252    &apt-cmdblurb;
 253
 254    <variablelist>
 255      <varlistentry><term><option>--no-install-recommends</option></term>
 256      <listitem><para>Do not consider recommended packages as a dependency for installing.
 257      Configuration Item: <literal>APT::Install-Recommends</literal>.</para></listitem>
 258      </varlistentry>
 259
 260      <varlistentry><term><option>--install-suggests</option></term>
 261      <listitem><para>Consider suggested packages as a dependency for installing.
 262      Configuration Item: <literal>APT::Install-Suggests</literal>.</para></listitem>
 263      </varlistentry>
 264
 265      <varlistentry><term><option>-d</option></term><term><option>--download-only</option></term>
 266      <listitem><para>Download only; package files are only retrieved, not unpacked or installed.
 267      Configuration Item: <literal>APT::Get::Download-Only</literal>.</para></listitem>
 268      </varlistentry>
 269
 270      <varlistentry><term><option>-f</option></term><term><option>--fix-broken</option></term>
 271      <listitem><para>Fix; attempt to correct a system with broken dependencies in
 272      place. This option, when used with install/remove, can omit any packages
 273      to permit APT to deduce a likely solution. If packages are specified,
 274      these have to completely correct the problem. The option is sometimes necessary when
 275      running APT for the first time; APT itself does not allow broken package
 276      dependencies to exist on a system. It is possible that a system's
 277      dependency structure can be so corrupt as to require manual intervention
 278      (which usually means using <command>dpkg --remove</command> to eliminate some of
 279      the offending packages). Use of this option together with <option>-m</option> may produce an
 280      error in some situations.
 281      Configuration Item: <literal>APT::Get::Fix-Broken</literal>.</para></listitem>
 282      </varlistentry>
 283
 284      <varlistentry><term><option>-m</option></term><term><option>--ignore-missing</option></term>
 285      <term><option>--fix-missing</option></term>
 286      <listitem><para>Ignore missing packages; if packages cannot be retrieved or fail the
 287      integrity check after retrieval (corrupted package files), hold back
 288      those packages and handle the result. Use of this option together with
 289      <option>-f</option> may produce an error in some situations. If a package is
 290      selected for installation (particularly if it is mentioned on the
 291      command line) and it could not be downloaded then it will be silently
 292      held back.
 293      Configuration Item: <literal>APT::Get::Fix-Missing</literal>.</para></listitem>
 294      </varlistentry>
 295
 296      <varlistentry><term><option>--no-download</option></term>
 297      <listitem><para>Disables downloading of packages. This is best used with
 298      <option>--ignore-missing</option> to force APT to use only the .debs it has
 299      already downloaded.
 300      Configuration Item: <literal>APT::Get::Download</literal>.</para></listitem>
 301      </varlistentry>
 302
 303      <varlistentry><term><option>-q</option></term><term><option>--quiet</option></term>
 304      <listitem><para>Quiet; produces output suitable for logging, omitting progress indicators.
 305      More q's will produce more quiet up to a maximum of 2. You can also use
 306      <option>-q=#</option> to set the quiet level, overriding the configuration file.
 307      Note that quiet level 2 implies <option>-y</option>; you should never use -qq
 308      without a no-action modifier such as -d, --print-uris or -s as APT may
 309      decide to do something you did not expect.
 310      Configuration Item: <literal>quiet</literal>.</para></listitem>
 311      </varlistentry>
 312
 313      <varlistentry><term><option>-s</option></term>
 314                    <term><option>--simulate</option></term>
 315                    <term><option>--just-print</option></term>
 316                    <term><option>--dry-run</option></term>
 317                    <term><option>--recon</option></term>
 318                    <term><option>--no-act</option></term>
 319      <listitem><para>No action; perform a simulation of events that would occur but do not
 320      actually change the system.
 321      Configuration Item: <literal>APT::Get::Simulate</literal>.</para>
 322
 323      <para>Simulated runs performed as a user will automatically deactivate locking
 324      (<literal>Debug::NoLocking</literal>), and if the option
 325      <literal>APT::Get::Show-User-Simulation-Note</literal> is set
 326      (as it is by default) a notice will also be displayed indicating that
 327      this is only a simulation. Runs performed as root do not trigger either
 328      NoLocking or the notice - superusers should know what they are doing
 329      without further warnings from <literal>apt-get</literal>.</para>
 330
 331      <para>Simulated runs print out a series of lines, each representing a <command>dpkg</command>
 332      operation: configure (<literal>Conf</literal>), remove (<literal>Remv</literal>)
 333      or unpack (<literal>Inst</literal>). Square brackets indicate broken packages, and
 334      empty square brackets indicate breaks that are of no consequence (rare).</para></listitem>
 335      </varlistentry>
 336
 337      <varlistentry><term><option>-y</option></term><term><option>--yes</option></term>
 338                    <term><option>--assume-yes</option></term>
 339      <listitem><para>Automatic yes to prompts; assume "yes" as answer to all prompts and run
 340      non-interactively. If an undesirable situation, such as changing a held
 341      package, trying to install a unauthenticated package or removing an essential package
 342      occurs then <literal>apt-get</literal> will abort.
 343      Configuration Item: <literal>APT::Get::Assume-Yes</literal>.</para></listitem>
 344      </varlistentry>
 345
 346      <varlistentry><term><option>--assume-no</option></term>
 347      <listitem><para>Automatic "no" to all prompts.
 348      Configuration Item: <literal>APT::Get::Assume-No</literal>.</para></listitem>
 349      </varlistentry>
 350
 351      <varlistentry><term><option>-u</option></term><term><option>--show-upgraded</option></term>
 352      <listitem><para>Show upgraded packages; print out a list of all packages that are to be
 353      upgraded.
 354      Configuration Item: <literal>APT::Get::Show-Upgraded</literal>.</para></listitem>
 355      </varlistentry>
 356
 357      <varlistentry><term><option>-V</option></term><term><option>--verbose-versions</option></term>
 358      <listitem><para>Show full versions for upgraded and installed packages.
 359      Configuration Item: <literal>APT::Get::Show-Versions</literal>.</para></listitem>
 360      </varlistentry>
 361
 362      <varlistentry><term><option>-a</option></term>
 363                    <term><option>--host-architecture</option></term>
 364      <listitem><para>This option controls the architecture packages are built for
 365      by <command>apt-get source --compile</command> and how cross-builddependencies
 366      are satisfied. By default is it not set which means that the host architecture
 367      is the same as the build architecture (which is defined by <literal>APT::Architecture</literal>).
 368      Configuration Item: <literal>APT::Get::Host-Architecture</literal>.
 369      </para></listitem>
 370      </varlistentry>
 371
 372      <varlistentry><term><option>-P</option></term>
 373                    <term><option>--build-profiles</option></term>
 374      <listitem><para>This option controls the activated build profiles for which
 375      a source package is built by <command>apt-get source --compile</command> and
 376      how build dependencies are satisfied. By default no build profile is active.
 377      More than one build profile can be activated at a time by concatenating them
 378      with a comma.
 379      Configuration Item: <literal>APT::Build-Profiles</literal>.
 380      </para></listitem>
 381      </varlistentry>
 382
 383      <varlistentry><term><option>-b</option></term><term><option>--compile</option></term>
 384                    <term><option>--build</option></term>
 385      <listitem><para>Compile source packages after downloading them.
 386      Configuration Item: <literal>APT::Get::Compile</literal>.</para></listitem>
 387      </varlistentry>
 388
 389      <varlistentry><term><option>--ignore-hold</option></term>
 390      <listitem><para>Ignore package holds; this causes <command>apt-get</command> to ignore a hold
 391      placed on a package. This may be useful in conjunction with
 392      <literal>dist-upgrade</literal> to override a large number of undesired holds.
 393      Configuration Item: <literal>APT::Ignore-Hold</literal>.</para></listitem>
 394      </varlistentry>
 395
 396      <varlistentry><term><option>--with-new-pkgs</option></term>
 397      <listitem><para>Allow installing new packages when used in
 398      conjunction with <literal>upgrade</literal>.  This is useful if
 399      the update of a installed package requires new dependencies to be
 400      installed. Instead of holding the package back <literal>upgrade</literal>
 401      will upgrade the package and install the new dependencies. Note that
 402      <literal>upgrade</literal> with this option will never remove packages,
 403      only allow adding new ones.
 404      Configuration Item:  <literal>APT::Get::Upgrade-Allow-New</literal>.
 405      </para></listitem>
 406      </varlistentry>
 407
 408      <varlistentry><term><option>--no-upgrade</option></term>
 409      <listitem><para>Do not upgrade packages; when used in conjunction with <literal>install</literal>,
 410      <literal>no-upgrade</literal> will prevent packages on the command line
 411      from being upgraded if they are already installed.
 412      Configuration Item: <literal>APT::Get::Upgrade</literal>.</para></listitem>
 413      </varlistentry>
 414
 415      <varlistentry><term><option>--only-upgrade</option></term>
 416      <listitem><para>Do not install new packages; when used in conjunction
 417      with <literal>install</literal>, <literal>only-upgrade</literal> will
 418      install upgrades for already installed packages only and ignore requests
 419      to install new packages.
 420      Configuration Item: <literal>APT::Get::Only-Upgrade</literal>.</para></listitem>
 421      </varlistentry>
 422
 423      <varlistentry><term><option>--force-yes</option></term>
 424      <listitem><para>Force yes; this is a dangerous option that will cause apt to continue
 425      without prompting if it is doing something potentially harmful. It
 426      should not be used except in very special situations. Using
 427      <literal>force-yes</literal> can potentially destroy your system!
 428      Configuration Item: <literal>APT::Get::force-yes</literal>.</para></listitem>
 429      </varlistentry>
 430
 431      <varlistentry><term><option>--print-uris</option></term>
 432      <listitem><para>Instead of fetching the files to install their URIs are printed. Each
 433      URI will have the path, the destination file name, the size and the expected
 434      MD5 hash. Note that the file name to write to will not always match
 435      the file name on the remote site! This also works with the
 436      <literal>source</literal> and <literal>update</literal> commands. When used with the
 437      <literal>update</literal> command the MD5 and size are not included, and it is
 438      up to the user to decompress any compressed files.
 439      Configuration Item: <literal>APT::Get::Print-URIs</literal>.</para></listitem>
 440      </varlistentry>
 441
 442      <varlistentry><term><option>--purge</option></term>
 443      <listitem><para>Use purge instead of remove for anything that would be removed.
 444      An asterisk ("*") will be displayed next to packages which are
 445          scheduled to be purged. <option>remove --purge</option> is equivalent to the
 446          <option>purge</option> command.
 447      Configuration Item: <literal>APT::Get::Purge</literal>.</para></listitem>
 448      </varlistentry>
 449
 450      <varlistentry><term><option>--reinstall</option></term>
 451      <listitem><para>Re-install packages that are already installed and at the newest version.
 452      Configuration Item: <literal>APT::Get::ReInstall</literal>.</para></listitem>
 453      </varlistentry>
 454
 455      <varlistentry><term><option>--list-cleanup</option></term>
 456      <listitem><para>This option is on by default; use <literal>--no-list-cleanup</literal> to turn
 457      it off. When it is on, <command>apt-get</command> will automatically manage the contents
 458      of <filename>&statedir;/lists</filename> to ensure that obsolete files are erased.
 459      The only reason to turn it off is if you frequently change your sources list.
 460      Configuration Item: <literal>APT::Get::List-Cleanup</literal>.</para></listitem>
 461      </varlistentry>
 462
 463      <varlistentry><term><option>-t</option></term>
 464                    <term><option>--target-release</option></term>
 465                    <term><option>--default-release</option></term>
 466      <listitem><para>This option controls the default input to the policy engine; it creates
 467      a default pin at priority 990 using the specified release string.
 468      This overrides the general settings in <filename>/etc/apt/preferences</filename>.
 469      Specifically pinned packages are not affected by the value
 470      of this option. In short, this option
 471      lets you have simple control over which distribution packages will be
 472      retrieved from. Some common examples might be
 473      <option>-t '2.1*'</option>, <option>-t unstable</option>
 474      or <option>-t sid</option>.
 475      Configuration Item: <literal>APT::Default-Release</literal>;
 476      see also the &apt-preferences; manual page.</para></listitem>
 477      </varlistentry>
 478
 479      <varlistentry><term><option>--trivial-only</option></term>
 480      <listitem><para>
 481      Only perform operations that are 'trivial'. Logically this can be considered
 482      related to <option>--assume-yes</option>; where <option>--assume-yes</option> will answer
 483      yes to any prompt, <option>--trivial-only</option> will answer no.
 484      Configuration Item: <literal>APT::Get::Trivial-Only</literal>.</para></listitem>
 485      </varlistentry>
 486
 487      <varlistentry><term><option>--no-remove</option></term>
 488      <listitem><para>If any packages are to be removed apt-get immediately aborts without
 489      prompting.
 490      Configuration Item: <literal>APT::Get::Remove</literal>.</para></listitem>
 491      </varlistentry>
 492
 493      <varlistentry><term><option>--auto-remove</option></term>
 494      <listitem><para>If the command is either <literal>install</literal> or <literal>remove</literal>,
 495      then this option acts like running the <literal>autoremove</literal> command, removing unused
 496      dependency packages. Configuration Item: <literal>APT::Get::AutomaticRemove</literal>.
 497      </para></listitem>
 498      </varlistentry>
 499
 500      <varlistentry><term><option>--only-source</option></term>
 501      <listitem><para>Only has meaning for the
 502      <literal>source</literal> and <literal>build-dep</literal>
 503      commands.  Indicates that the given source names are not to be
 504      mapped through the binary table.  This means that if this option
 505      is specified, these commands will only accept source package
 506      names as arguments, rather than accepting binary package names
 507      and looking up the corresponding source package.  Configuration
 508      Item: <literal>APT::Get::Only-Source</literal>.</para></listitem>
 509      </varlistentry>
 510
 511      <varlistentry><term><option>--diff-only</option></term><term><option>--dsc-only</option></term><term><option>--tar-only</option></term>
 512      <listitem><para>Download only the diff, dsc, or tar file of a source archive.
 513      Configuration Item: <literal>APT::Get::Diff-Only</literal>, <literal>APT::Get::Dsc-Only</literal>, and
 514      <literal>APT::Get::Tar-Only</literal>.</para></listitem>
 515      </varlistentry>
 516
 517      <varlistentry><term><option>--arch-only</option></term>
 518      <listitem><para>Only process architecture-dependent build-dependencies.
 519      Configuration Item: <literal>APT::Get::Arch-Only</literal>.</para></listitem>
 520      </varlistentry>
 521
 522      <varlistentry><term><option>--allow-unauthenticated</option></term>
 523      <listitem><para>Ignore if packages can't be authenticated and don't prompt about it.
 524      This is useful for tools like pbuilder.
 525      Configuration Item: <literal>APT::Get::AllowUnauthenticated</literal>.</para></listitem>
 526      </varlistentry>
 527
 528      <varlistentry><term><option>--no-allow-insecure-repositories</option></term>
 529      <listitem><para>Forbid the update command to acquire unverifiable
 530      data from configured sources. Apt will fail at the update command
 531      for repositories without valid cryptographically signatures.
 532
 533      Configuration Item: <literal>Acquire::AllowInsecureRepositories</literal>.</para></listitem>
 534      </varlistentry>
 535
 536      <varlistentry><term><option>--show-progress</option></term>
 537      <listitem><para>Show user friendly progress information in the
 538      terminal window when packages are installed, upgraded or
 539      removed. For a machine parsable version of this data see
 540      README.progress-reporting in the apt doc directory.
 541      Configuration Item: <literal>Dpkg::Progress</literal> and <literal>Dpkg::Progress-Fancy</literal>.</para></listitem>
 542      </varlistentry>
 543
 544
 545      &apt-commonoptions;
 546
 547    </variablelist>
 548  </refsect1>
 549
 550  <refsect1><title>Files</title>
 551    <variablelist>
 552      &file-sourceslist;
 553      &file-aptconf;
 554      &file-preferences;
 555      &file-cachearchives;
 556      &file-statelists;
 557    </variablelist>
 558  </refsect1>
 559
 560  <refsect1><title>See Also</title>
 561    <para>&apt-cache;, &apt-cdrom;, &dpkg;, &sources-list;,
 562    &apt-conf;, &apt-config;, &apt-secure;,
 563    The APT User's guide in &guidesdir;, &apt-preferences;, the APT Howto.</para>
 564  </refsect1>
 565
 566  <refsect1><title>Diagnostics</title>
 567    <para><command>apt-get</command> returns zero on normal operation, decimal 100 on error.</para>
 568  </refsect1>
 569  &manbugs;
 570 </refentry>