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dpkg-parsechangelog(1)            dpkg suite            dpkg-parsechangelog(1)

NAME
       dpkg-parsechangelog - parse Debian changelog files

SYNOPSIS
       dpkg-parsechangelog [option...]

DESCRIPTION
       dpkg-parsechangelog reads and parses the changelog of an unpacked
       Debian source tree and outputs the information in it to standard output
       in a machine-readable form.

OPTIONS
       -l, --file changelog-file
           Specifies the changelog file to read information from.  A ‘-’ can
           be used to specify reading from standard input.  The default is
           debian/changelog.

       -F changelog-format
           Specifies the format of the changelog. By default the format is
           read from a special line near the bottom of the changelog or
           failing that defaults to the debian standard format. See also
           CHANGELOG FORMATS.

       -L libdir
           Obsolete option without effect (since dpkg 1.18.8).  Setting the
           perl environment variables PERL5LIB or PERLLIB has a similar effect
           when looking for the parser perl modules.

       -S, --show-field field
           Specifies the name of the field to show (since dpkg 1.17.0).  The
           field name is not printed, only its value.

       -?, --help
           Show the usage message and exit.

       --version
           Show the version and exit.

   Parser Options
       The following options can be used to influence the output of the
       changelog parser, for example the range of entries or the format of the
       output.

       --format output-format
           Set the output format. Currently supported values are dpkg and
           rfc822.  dpkg is the classic output format (from before this option
           existed) and the default. It consists of one stanza in Debian
           control format (see deb-control(5)). If more than one entry is
           requested, then most fields are taken from the first entry (usually
           the most recent entry), except otherwise stated:

           Source: pkg-name
           Version: version
           Distribution: target-distribution
           Urgency: urgency
               The highest urgency of all included entries is used, followed
               by the concatenated (space-separated) comments from all the
               versions requested.

           Maintainer: author
           Date: date
               The date of the entry as a string, as it appears in the
               changelog.  With a strptime(3) format "%a, %d %b %Y %T %z", but
               where the day of the week might not actually correspond to the
               real day obtained from the rest of the date string.  If you
               need a more accurate representation of the date, use the
               Timestamp field, but take into account it might not be possible
               to map it back to the exact value in this field.

           Timestamp: timestamp
               The date of the entry as a timestamp in seconds since the epoch
               (since dpkg 1.18.8).

           Closes: bug-number
               The Closes fields of all included entries are merged.

           Changes: changelog-entries
               The text of all changelog entries is concatenated. To make this
               field a valid Debian control format multiline field empty lines
               are replaced with a single full stop and all lines is intended
               by one space character. The exact content depends on the
               changelog format.

           The Version, Distribution, Urgency, Maintainer and Changes fields
           are mandatory.

           There might be additional user-defined fields present.

           The rfc822 format uses the same fields but outputs a separate
           stanza for each changelog entry so that all metadata for each entry
           is preserved.

       --reverse
           Include all changes in reverse order (since dpkg 1.19.1).

           Note: For the dpkg format the first entry will be the most ancient
           entry.

       --all
           Include all changes.  Note: Other options have no effect when this
           is in use.

       -s, --since version
       -v version
           Include all changes later than version.

       -u, --until version
           Include all changes earlier than version.

       -f, --from version
           Include all changes equal or later than version.

       -t, --to version
           Include all changes up to or equal than version.

       -c, --count number
       -n number
           Include number entries from the top (or the tail if number is lower
           than 0).

       -o, --offset number
           Change the starting point for --count, counted from the top (or the
           tail if number is lower than 0).

CHANGELOG FORMATS
       It is possible to use a different format to the standard one, by
       providing a parser for that alternative format.

       In order to have dpkg-parsechangelog run the new parser, a line must be
       included within the last 40 lines of the changelog file, matching the
       Perl regular expression: “\schangelog-format:\s+([0-9a-z]+)\W”.  The
       part in parentheses should be the name of the format. For example:

           @@@ changelog-format: otherformat @@@

       Changelog format names are non-empty strings of lowercase alphanumerics
       (“a-z0-9”).

       If such a line exists then dpkg-parsechangelog will look for the parser
       as a Dpkg::Changelog::Otherformat perl module; it is an error for it
       not being present.  The parser name in the perl module will be
       automatically capitalized.  The default changelog format is debian, and
       a parser for it is provided by default.

       The parser should be derived from the Dpkg::Changelog class and
       implement the required documented interface.

       If the changelog format which is being parsed always or almost always
       leaves a blank line between individual change notes, these blank lines
       should be stripped out, so as to make the resulting output compact.

       If the changelog format does not contain date or package name
       information this information should be omitted from the output. The
       parser should not attempt to synthesize it or find it from other
       sources.

       If the changelog does not have the expected format the parser should
       error out, rather than trying to muddle through and possibly generating
       incorrect output.

       A changelog parser may not interact with the user at all.

NOTES
       All Parser Options except for -v are only supported since dpkg 1.14.16.

       Short option parsing with non-bundled values available only since dpkg
       1.18.0.

ENVIRONMENT
       DPKG_COLORS
           Sets the color mode (since dpkg 1.18.5).  The currently accepted
           values are: auto (default), always and never.

       DPKG_NLS
           If set, it will be used to decide whether to activate Native
           Language Support, also known as internationalization (or i18n)
           support (since dpkg 1.19.0).  The accepted values are: 0 and 1
           (default).

FILES
       debian/changelog
           The changelog file, used to obtain version-dependent information
           about the source package, such as the urgency and distribution of
           an upload, the changes made since a particular release, and the
           source version number itself.

SEE ALSO
       deb-changelog(5).

1.21.22                           2023-05-11            dpkg-parsechangelog(1)

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