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SOURCES.LIST(5)			      APT		       SOURCES.LIST(5)

NAME
       sources.list - List of configured APT data sources

DESCRIPTION
       The source list /etc/apt/sources.list is designed to support any number
       of active sources and a variety of source media. The file lists one
       source per line, with the most preferred source listed first. The
       information available from the configured sources is acquired by
       apt-get update (or by an equivalent command from another APT
       front-end).

       Each line specifying a source starts with type (e.g.  deb-src) followed
       by options and arguments for this type. Individual entries cannot be
       continued onto a following line. Empty lines are ignored, and a #
       character anywhere on a line marks the remainder of that line as a
       comment.

SOURCES.LIST.D
       The /etc/apt/sources.list.d directory provides a way to add
       sources.list entries in separate files. The format is the same as for
       the regular sources.list file. File names need to end with .list and
       may only contain letters (a-z and A-Z), digits (0-9), underscore (_),
       hyphen (-) and period (.) characters. Otherwise APT will print a notice
       that it has ignored a file, unless that file matches a pattern in the
       Dir::Ignore-Files-Silently configuration list - in which case it will
       be silently ignored.

THE DEB AND DEB-SRC TYPES
       The deb type references a typical two-level Debian archive,
       distribution/component. The distribution is generally an archive name
       like stable or testing or a codename like wheezy or jessie while
       component is one of main, contrib or non-free. The deb-src type
       references a Debian distribution's source code in the same form as the
       deb type. A deb-src line is required to fetch source indexes.

       The format for a sources.list entry using the deb and deb-src types is:

	   deb [ options ] uri suite [component1] [component2] [...]

       Alternatively a rfc822 style format is also supported:

		Types: deb deb-src
		URIs: http://example.com
		Suites: stable testing
		Sections: component1 component2
		Description: short
		 long long long
		[option1]: [option1-value]

		Types: deb
		URIs: http://another.example.com
		Suites: experimental
		Sections: component1 component2
		Enabled: no
		Description: short
		 long long long
		[option1]: [option1-value]

       The URI for the deb type must specify the base of the Debian
       distribution, from which APT will find the information it needs.	 suite
       can specify an exact path, in which case the components must be omitted
       and suite must end with a slash (/). This is useful for the case when
       only a particular sub-section of the archive denoted by the URI is of
       interest. If suite does not specify an exact path, at least one
       component must be present.

       suite may also contain a variable, $(ARCH) which expands to the Debian
       architecture (such as amd64 or armel) used on the system. This permits
       architecture-independent sources.list files to be used. In general this
       is only of interest when specifying an exact path, APT will
       automatically generate a URI with the current architecture otherwise.

       In the traditional style sources.list format since only one
       distribution can be specified per line it may be necessary to have
       multiple lines for the same URI, if a subset of all available
       distributions or components at that location is desired. APT will sort
       the URI list after it has generated a complete set internally, and will
       collapse multiple references to the same Internet host, for instance,
       into a single connection, so that it does not inefficiently establish
       an FTP connection, close it, do something else, and then re-establish a
       connection to that same host. This feature is useful for accessing busy
       FTP sites with limits on the number of simultaneous anonymous users.
       APT also parallelizes connections to different hosts to more
       effectively deal with sites with low bandwidth.

       options is always optional and needs to be surrounded by square
       brackets. It can consist of multiple settings in the form
       setting=value. Multiple settings are separated by spaces. The following
       settings are supported by APT (note however that unsupported settings
       will be ignored silently):

       ·   arch=arch1,arch2,...	 can be used to specify for which
	   architectures information should be downloaded. If this option is
	   not set all architectures defined by the APT::Architectures option
	   will be downloaded.

       ·   arch+=arch1,arch2,...  and arch-=arch1,arch2,...  which can be used
	   to add/remove architectures from the set which will be downloaded.

       ·   trusted=yes can be set to indicate that packages from this source
	   are always authenticated even if the Release file is not signed or
	   the signature can't be checked. This disables parts of apt-
	   secure(8) and should therefore only be used in a local and trusted
	   context.  trusted=no is the opposite which handles even correctly
	   authenticated sources as not authenticated.

       It is important to list sources in order of preference, with the most
       preferred source listed first. Typically this will result in sorting by
       speed from fastest to slowest (CD-ROM followed by hosts on a local
       network, followed by distant Internet hosts, for example).

       Some examples:

	   deb http://ftp.debian.org/debian wheezy main contrib non-free
	   deb http://security.debian.org/ wheezy/updates main contrib non-free

URI SPECIFICATION
       The currently recognized URI types are:

       file
	   The file scheme allows an arbitrary directory in the file system to
	   be considered an archive. This is useful for NFS mounts and local
	   mirrors or archives.

       cdrom
	   The cdrom scheme allows APT to use a local CD-ROM drive with media
	   swapping. Use the apt-cdrom(8) program to create cdrom entries in
	   the source list.

       http
	   The http scheme specifies an HTTP server for the archive. If an
	   environment variable http_proxy is set with the format
	   http://server:port/, the proxy server specified in http_proxy will
	   be used. Users of authenticated HTTP/1.1 proxies may use a string
	   of the format http://user:pass@server:port/. Note that this is an
	   insecure method of authentication.

       ftp
	   The ftp scheme specifies an FTP server for the archive. APT's FTP
	   behavior is highly configurable; for more information see the
	   apt.conf(5) manual page. Please note that an FTP proxy can be
	   specified by using the ftp_proxy environment variable. It is
	   possible to specify an HTTP proxy (HTTP proxy servers often
	   understand FTP URLs) using this environment variable and only this
	   environment variable. Proxies using HTTP specified in the
	   configuration file will be ignored.

       copy
	   The copy scheme is identical to the file scheme except that
	   packages are copied into the cache directory instead of used
	   directly at their location. This is useful for people using
	   removable media to copy files around with APT.

       rsh, ssh
	   The rsh/ssh method invokes RSH/SSH to connect to a remote host and
	   access the files as a given user. Prior configuration of rhosts or
	   RSA keys is recommended. The standard find and dd commands are used
	   to perform the file transfers from the remote host.

       adding more recognizable URI types
	   APT can be extended with more methods shipped in other optional
	   packages, which should follow the naming scheme
	   apt-transport-method. For instance, the APT team also maintains the
	   package apt-transport-https, which provides access methods for
	   HTTPS URIs with features similar to the http method. Methods for
	   using e.g. debtorrent are also available - see apt-transport-
	   debtorrent(1).

EXAMPLES
       Uses the archive stored locally (or NFS mounted) at /home/jason/debian
       for stable/main, stable/contrib, and stable/non-free.

	   deb file:/home/jason/debian stable main contrib non-free

       As above, except this uses the unstable (development) distribution.

	   deb file:/home/jason/debian unstable main contrib non-free

       Source line for the above

	   deb-src file:/home/jason/debian unstable main contrib non-free

       The first line gets package information for the architectures in
       APT::Architectures while the second always retrieves amd64 and armel.

	   deb http://ftp.debian.org/debian wheezy main
	   deb [ arch=amd64,armel ] http://ftp.debian.org/debian wheezy main

       Uses HTTP to access the archive at archive.debian.org, and uses only
       the hamm/main area.

	   deb http://archive.debian.org/debian-archive hamm main

       Uses FTP to access the archive at ftp.debian.org, under the debian
       directory, and uses only the wheezy/contrib area.

	   deb ftp://ftp.debian.org/debian wheezy contrib

       Uses FTP to access the archive at ftp.debian.org, under the debian
       directory, and uses only the unstable/contrib area. If this line
       appears as well as the one in the previous example in sources.list a
       single FTP session will be used for both resource lines.

	   deb ftp://ftp.debian.org/debian unstable contrib

       Uses HTTP to access the archive at ftp.tlh.debian.org, under the
       universe directory, and uses only files found under
       unstable/binary-i386 on i386 machines, unstable/binary-amd64 on amd64,
       and so forth for other supported architectures. [Note this example only
       illustrates how to use the substitution variable; official debian
       archives are not structured like this]

	   deb http://ftp.tlh.debian.org/universe unstable/binary-$(ARCH)/

SEE ALSO
       apt-cache(8)apt.conf(5)

BUGS
       APT bug page[1]. If you wish to report a bug in APT, please see
       /usr/share/doc/debian/bug-reporting.txt or the reportbug(1) command.

AUTHORS
       Jason Gunthorpe

       APT team

NOTES
	1. APT bug page
	   http://bugs.debian.org/src:apt

APT 1.0.1ubuntu2		18 January 2014		       SOURCES.LIST(5)
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