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FILTERDIFF(1)			   Man pages			 FILTERDIFF(1)

NAME
       filterdiff - extract or exclude diffs from a diff file

SYNOPSIS
       filterdiff [[-i PATTERN] | [--include=PATTERN]] [[-I FILE] |
		  [--include-from-file=FILE]] [[-p n] | [--strip-match=n]]
		  [--strip=n] [--addprefix=PREFIX] [--addoldprefix=PREFIX]
		  [--addnewprefix=PREFIX] [[-x PATTERN] | [--exclude=PATTERN]]
		  [[-X FILE] | [--exclude-from-file=FILE]] [[-v] |
		  [--verbose]] [--clean] [[-z] | [--decompress]] [[-# RANGE] |
		  [--hunks=RANGE]] [--lines=RANGE] [--files=RANGE]
		  [--annotate] [--format=FORMAT] [--as-numbered-lines=WHEN]
		  [--remove-timestamps] [file...]

       filterdiff {[--help] | [--version] | [--list] | [--grep ...]}

DESCRIPTION
       You can use filterdiff to obtain a patch that applies to files matching
       the shell wildcard PATTERN from a larger collection of patches. For
       example, to see the patches in patch-2.4.3.gz that apply to all files
       called lp.c:

	   filterdiff -z -i '*/lp.c' patch-2.4.3.gz

       If neither -i nor -x options are given, -i '*' is assumed. This way
       filterdiff can be used to clean up an existing diff file, removing
       redundant lines from the beginning (eg. the text from the mail body) or
       between the chunks (eg. in CVS diffs). To extract pure patch data, use
       a command like this:

	   filterdiff message-with-diff-in-the-body > patch

       Note that the interpretation of the shell wildcard pattern does not
       count slash characters or periods as special (in other words, no flags
       are given to fnmatch). This is so that “*/basename”-type patterns can
       be given without limiting the number of pathname components.

       You can use both unified and context format diffs with this program.

OPTIONS
       -i PATTERN, --include=PATTERN
	   Include only files matching PATTERN. All other lines in the input
	   are suppressed.

       -I FILE, --include-from-file=FILE
	   Include only files matching any pattern listed in FILE, one pattern
	   per line. All other lines in the input are suppressed.

       -x PATTERN, --exclude=PATTERN
	   Exclude files matching PATTERN. All other lines in the input are
	   displayed.

       -X FILE, --exclude-from-file=FILE
	   Exclude files matching any pattern listed in FILE, one pattern per
	   line. All other lines in the input are displayed.

       -p n, --strip-match=n
	   When matching, ignore the first n components of the pathname.

       -# RANGE, --hunks=RANGE
	   Only include hunks within the specified RANGE. Hunks are numbered
	   from 1, and the range is a comma-separated list of numbers or
	   “first-last” spans; either the first or the last in the span may be
	   omitted to indicate no limit in that direction.

       --lines=RANGE
	   Only include hunks that contain lines from the original file that
	   lie within the specified RANGE. Lines are numbered from 1, and the
	   range is a comma-separated list of numbers or “first-last” spans;
	   either the first or the last in the span may be omitted to indicate
	   no limit in that direction.

       --files=RANGE
	   Only include files indicated by the specified RANGE. Files are
	   numbered from 1 in the order they appear in the patch input, and
	   the range is a comma-separated list of numbers or “first-last”
	   spans; either the first or the last in the span may be omitted to
	   indicate no limit in that direction.

       --annotate
	   Annotate each hunk with the filename and hunk number.

       --format=unified|context
	   Use specified output format.

       --strip=n
	   Remove the first n components of pathnames in the output.

       --addprefix=PREFIX
	   Prefix pathnames in the output by PREFIX. This will override any
	   individual settings specified with the --addoldprefix or
	   --addnewprefix options.

       --addoldprefix=PREFIX
	   Prefix pathnames for old or original files in the output by PREFIX.

       --addnewprefix=PREFIX
	   Prefix pathnames for updated or new files in the output by PREFIX.

       --as-numbered-lines=before|after
	   Instead of a patch fragment, display the lines of the selected
	   hunks with the line number of the file before (or after) the patch
	   is applied, followed by a TAB character and a colon, at the
	   beginning of each line. Each hunk except the first will have a line
	   consisting of “...”	before it.

       --remove-timestamps
	   Do not include file timestamps in the output.

       -v, --verbose
	   Always show non-diff lines in the output. By default, non-diff
	   lines are only shown when excluding a filename pattern.

       --clean
	   Always remove all non-diff lines from the output. Even when
	   excluding a filename pattern.

       -z, --decompress
	   Decompress files with extensions .gz and .bz2.

       --help
	   Display a short usage message.

       --version
	   Display the version number of filterdiff.

       --list
	   Behave like lsdiff(1) instead.

       --grep
	   Behave like grepdiff(1) instead.

EXAMPLES
       To see all patch hunks that affect the first five lines of a C file:

	   filterdiff -i '*.c' --lines=-5 < patch

       To see the first hunk of each file patch, use:

	   filterdiff -#1 patchfile

       To see patches modifying a ChangeLog file in a subdirectory, use:

	   filterdiff -p1 Changelog

       To see the complete patches for each patch that modifies line 1 of the
       original file, use:

	   filterdiff --lines=1 patchfile | lsdiff | \
	     xargs -rn1 filterdiff patchfile -i

       To see all but the first hunk of a particular patch, you might use:

	   filterdiff -p1 -i file.c -#2- foo-patch

       If you have a very specific list of hunks in a patch that you want to
       see, list them:

	   filterdiff -#1,2,5-8,10,12,27-

       To see the lines of the files that would be patched as they will appear
       after the patch is applied, use:

	   filterdiff --as-numbered-lines=after patch.file

       You can see the same context before the patch is applied with:

	   filterdiff --as-numbered-lines=before
	   patch.file

       Filterdiff can also be used to convert between unified and context
       format diffs:

	   filterdiff -v --format=unified context.diff

SEE ALSO
       lsdiff(1), grepdiff(1)

AUTHOR
       Tim Waugh <twaugh@redhat.com>
	   Package maintainer

patchutils			  23 Jan 2009			 FILTERDIFF(1)
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