apt-listchanges(1) Show new changelog entries from Debian package archives


apt-listchanges [options ... ] {--apt | package.deb ... }


apt-listchanges is a tool to show what has been changed in a new version of a Debian package, as compared to the version currently installed on the system.

It does this by extracting the relevant entries from both the NEWS.Debian and changelog[.Debian] files, usually found in /usr/share/doc/package, from Debian package archives.

Given a set of filenames as arguments (or read from apt when using --apt), apt-listchanges will scan the files (assumed to be Debian package archives) for the relevant changelog entries, and display them all in a summary grouped by source package. The groups are sorted by the urgency of the most urgent change, and than by the package name. Changes within each package group are displayed in the order of their apperance in the changelog files, i.e. starting from the latest to the oldest; the --reverse option can be used to alter this order.


Read filenames from a specially-formatted pipeline (as provided by apt), rather than from command line arguments, and honor certain apt-specific options in the config file. This pipeline must be in "version 2" format, specified in the apt configuration.
-v, --verbose
Display additional (usually unwanted) information. For instance, print a message when a package of the same or older version is to be installed, or when a package is to be newly installed.
-f, --frontend
Select which frontend to use to display information to the user. Current frontends include:
Uses sensible-pager(1) command to display output. The command uses PAGER environment variable to choose your favourite pager. The "pager" option may be specified in the configuration file to select a specific pager for use with apt-listchanges.
Displays an HTML-formatted changelog with hyperlinks for bugs and email addresses using the sensible-browser(1) command that examines BROWSER environment variable to choose your favourite browser. The "browser" option may be specified in the configuration file to select a specific browser for use with apt-listchanges.
Uses your favorite pager to display output, but does so in an xterm (using the x-terminal-emulator alternative) in the background. This allows you to go on with the upgrade if you like, and continue to browse the changelogs. You can override the terminal emulator to be used with the "xterm" configuration option.
The logical combination of xterm-pager and browser. Only appropriate for text-mode browsers.
Dumps output to stdout, with no pauses.
Sends mail to the address specified with --email-address, and does not display changelogs.
Spawns a gtk window to display the changelogs. Needs python3-gi to be installed.
Does nothing. Can be used to prevent apt-listchanges from running when configured to run automatically from apt.
Please note that apt-listchanges will try to switch to an unprivileged user before spawning commands in "browser", "xterm-browser", and "xterm-pager" frontends. However this currently does not apply to the "pager" frontend. See also "ENVIRONMENT VARIABLES" below.
In addition to displaying it, mail a copy of the changelog data to the specified address. To only mail changelog entries, use this option with the special frontend 'mail'.
If sending mail copies is enabled (see --email-address above), this option selects whether the mail should be sent as an old good plain text data (which is the default behavior), or as html data with clickable links, which might be more convenient for people using graphical mail clients.
-c, --confirm
Once changelogs have been displayed, ask the user whether or not to proceed. If the user chooses not to proceed, a nonzero exit status will be returned, and apt will abort.
-a, --show-all
Rather than trying to display changelog entries that are newer than the currently installed version of the package, simply display all changelog entries for all packages. This is useful for viewing the entire changelog of a .deb before extracting it.
This option will cause apt-listchanges to keep track of the last version of a package for which changelogs have been displayed, to avoid redisplaying the same changelogs in a future invocation. The database is stored in the named file. Specify 'none' to disable this feature.
Display the contents of the seen database to standard output as a list of lines consising of source package name and its latest seen version, separated by space. This option requires the path to the seen database to be known: please either specify it using --save-seen option or pass --profile=apt option to have it read from the configuration file.
This option will cause apt-listchanges to show the entries later than the specified version. With this option, the only other argument you can pass is the path to a .deb file.
This option selects whether news (from NEWS.Debian et al.), changelogs (from changelog.Debian et al.) or both should be displayed. The default is to display only news.
Displays syntax information.
-h, --headers
These options will cause apt-listchanges to insert a header before each package's changelog showing the name of the package, and the names of the binary packages which are being upgraded (if there is more than one, or it differs from the source package name).
Display some debugging information
Select an option profile. name corresponds to a section in /etc/apt/listchanges.conf. The default when invoked from apt is "apt", and "cmdline" otherwise.
Show the changelog entries in reverse order.
--ignore-apt-assume, --ignore-debian-frontend
Disable forcing non-interactive frontend in some of the cases described in the "AUTOMATIC FRONTEND OVERRIDE" section below.
Choose frontend interactively. This option is mainly for testing purposes, please do not use it.


For a better integration with existing package management tools, apt-listchanges tries to detect if package upgrades are done in a non-interactive way, and automatically switches its frontend to 'text' when any of the following conditions is satisfied:

the standard output is not connected to terminal;
the --quiet (-q) option is given to apt-get(8) (or aptitude(8)); note however that when the option is used more than once, apt-listchanges switches the frontend to 'mail';
the --assume-yes (-y) option is given to apt-get(8));
the DEBIAN_FRONTEND environment variable is set to "noninteractive", and APT_LISTCHANGES_FRONTED is not set.

For backward compatibility purposes the last two of the above checks can be disabled either with "ignore_apt_assume=true" or "ignore_debian_frontend=true" configuration file entries (see "CONFIGURATION FILE" below) or by using the command line options: --ignore-apt-assume or --ignore-debian-frontend.

Please also note that the "mail" frontend is already non-interactive one, so it is never switched to the "text" frontend.

Additionally apt-listchanges overrides X11-based frontends ("gtk", "xterm-pager", "xterm-browser") with "pager" (or "browser" in case of "xterm-browser") when the environment variable DISPLAY is not set.


apt-listchanges reads its configuration from the /etc/apt/listchanges.conf. The file consists of sections with names enclosed in the square brackets. Each section should contain lines in the key=value format. Lines starting with the "#" sign are treated as comments and ignored.

Section is a name of profile that can be used as parameter of the --profile option.

Key is a name of some command-line option (except for --apt, --profile, --help) with the initial hyphens removed, and the remaining hyphens translated to underscores, for example: "email_format" or "save_seen".

Value represents the value of the corresponding option. For command-line options that do not take argument, like "confirm" or "header", the value should be set either to "1", "yes", "true", and "on" in order to enable the option, or to "0", "no", "false", and "off" to disable it.

Additionally key can be one of the following keywords: "browser", "pager" or "xterm". The value of such configuration entry should be the name of an appropriate command, eventually followed by its arguments, for example: "pager=less -R".

Example configuration file


The above configuration file specifies that in command-line mode, the default frontend should be "pager". In apt mode, the xterm-pager frontend is default, a copy of the changelogs (if any) should be emailed to root, and apt-listchanges should ask for confirmation. If apt-listchanges is invoked with --profile=custom, the browser frontend will be used, and invoke mozilla.


Frontend to use
The value of the first existing of the above variables will be used as the name of user to switch to when running commands spawned by the "browser", "xterm-browser", and "xterm-pager" frontends if apt-listchanges is started by a privileged user
If set to "noninteractive", then it can force apt-listchanges to use non-interactive frontend, see the "AUTOMATIC FRONTEND OVERRIDE" section for details.
Used by the browser frontend, should be set to a command expecting a file: URL for an HTML file to display.
Used by the pager frontend
File descriptor to read package names from in the --apt mode. (Apt is expected to set this variable to a proper file descriptor numer).


Configuration file
File used for registering apt-listchanges into apt system
Database used for save-seen


apt-listchanges was written by Matt Zimmerman <[email protected]>