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)