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RedHat 9 (Linux i386) - man page for filterdiff (redhat section 1)

FILTERDIFF(1)									    FILTERDIFF(1)

NAME
       filterdiff - extract or exclude diffs from a diff file

SYNOPSIS
       filterdiff [-i PATTERN] [-p n] [--strip=n] [--addprefix=PREFIX]
		  [-x PATTERN] [--verbose] [-v] [-z] [-# RANGE | --hunks=RANGE]
		  [--lines=RANGE] [--annotate] [--format=FORMAT] [--as-numbered-lines=WHEN]
		  [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. To remove lines from a file
       that are not part of a patch, you might do this:

	      filterdiff message > 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  compo-
       nents.

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

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

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

       -p 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 direc-
	      tion.

       --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.

       --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.

       --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  char-
	      acter  and  a colon, at the beginning of each line. Each hunk except the first will
	      have a line consisting of ``...'' before it.

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

       -z     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>.

patchutils				   23 Aug 2002				    FILTERDIFF(1)


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