grepdiff - Unix, Linux Command

NAME

grepdiff - show files modified by a diff containing a regex

SYNOPSIS

Tag	Description
grepdiff [-n] [--number-files] [-p n] [--strip=n] [--addprefix=PREFIX] [-s] [-i PATTERN] [-x PATTERN] [-v] [-E] [[-H] [--with-filename]] [[-h] [--no-filename]] [--output-matching=WHAT] {[REGEX] [-f FILE]} [file...] grepdiff {[--help] [--version] [--list] [--filter ...]}

DESCRIPTION

For each file modified by a patch, if the patch hunk contains the REGEX then the file’s name is printed.

The regular expression is treated as POSIX Basic Regular Expression syntax, unless the -E option is given in which case POSIX Extended Regular Expression syntax is used.

For example, to see the patches in my.patch which contain the regular expression \(lqpf_gfp_mask\(rq, use:

grepdiff pf_gfp_mask my.patch | \
  xargs -rn1 filterdiff my.patch -i

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

OPTIONS

Tag	Description
-n	Display the line number that each patch begins at. If verbose output is requested, each matching hunk is listed as well. For a description of the output format see lsdiff(1).
--number-files
	File numbers are listed, beginning at 1, before each filename.
-p n	When matching, ignore the first n components of the pathname.
--strip=n
	Remove the first n components of the pathname before displaying it.
--addprefix=PREFIX
	Prefix the pathname with PREFIX before displaying it.
-s	Show file additions, modifications and removals. A file addition is indicated by a \(lq+\(rq, a removal by a \(lq-\(rq, and a modification by a \(lq!\(rq.
-i PATTERN
	Include only files matching PATTERN.
-x PATTERN
	Exclude files matching PATTERN.
-E	Use POSIX Extended Regular Expression syntax.
-H, --with-filename
	Print the name of the patch file containing each match.
-h, --no-filename
	Suppress the name of the patch file containing each match.
-f FILE	Read regular expressions from FILE, one per line.
--output-matching=hunk\|file
	Display the matching hunk-level or file-level diffs.
--help	Display a short usage message.
--version
	Display the version number of grepdiff.
--filter
	Behave like filterdiff(1) instead.
--list	Behave like lsdiff(1) instead.

EXAMPLES

Consider the below patch file Hello.patch. It contains two patches generated from:
1. HelloWorld.c and HelloWorld_modified.c
2. HelloUniverse.c and HelloUniverse_modified.c

$ cat Hello.patch
--- HelloWorld.c        2016-02-25 18:42:08.000000000 +0530
+++ HelloWorld_modified.c       2016-02-25 18:43:22.000000000 +0530
@@ -2,5 +2,7 @@

 int main()
 {
-       printf("Hello World\n");
+       char *msg = "Hello World\n";
+
+       printf("%s", msg);
 }
--- HelloUniverse.c     2016-02-25 18:53:19.000000000 +0530
+++ HelloUniverse_modified.c    2016-02-25 18:53:37.000000000 +0530
@@ -2,5 +2,7 @@

 int main()
 {
-       printf("Hello Universe\n");
+       char *msg = "Hello Universe\n";
+
+       printf("%s", msg);
 }

Below two examples show basic usage of the command

1. Pattern matching in only one file

$ grepdiff "Hello World" Hello.patch
HelloWorld.c

$ grepdiff "Hello Universe" Hello.patch
HelloUniverse.c

2. Pattern matching in multiple files

$ grepdiff "Hello" Hello.patch
HelloWorld.c
HelloUniverse.c

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