From: Eric Raible <raible@gmail.com>
Date: Mon, 06 Jul 2009 23:39:43 GMT
Subject: Re: Does CVS has a easy way to compare file with its previous version?
Message-ID: <279b37b20907061639o6d6c72e7qf7bbc2459c7fc77e@mail.gmail.com>
In-Reply-To: <4A4DA7A5.7020303@gnu.org>

On Thu, Jul 2, 2009 at 11:39 PM, Paolo Bonzini<bonzini@gnu.org> wrote:
> On 07/02/2009 08:04 PM, Eric Raible wrote:
>>
>> Isn't the first one incorrect because<file>  needs to be inside the
>> backticks?
>> git diff `git log -2 --pretty=format:%h<file>` --<file>
>>
>> And isn't the replacement incorrect also (the diffs are backwards)?
>> git log --no-merges -p -R -1<file>
>
> Yes and no.
>
> Paolo
>

Are you sure that you didn't mean yes and yes?

As the transcript shows the git-diff form produces a
backwards diff.  Thus to get the same output git-log
needs the -R:

$ git init
$ perl -e 'for (0..10) { print "$_\n" }' > file
$ git add file
$ git commit -minitial
[master (root-commit) 2d451ec] initial
 1 files changed, 11 insertions(+), 0 deletions(-)
 create mode 100644 file
$ sed -e 's/4/four/' < file > file1
$ mv file1 file
$ git commit -a -m'updated'
[master d49613a] updated
 1 files changed, 1 insertions(+), 1 deletions(-)
$ git diff `git log -2 --pretty=format:%h file` -- file
diff --git a/file b/file
index b29b605..b033488 100644
--- a/file
+++ b/file
@@ -2,7 +2,7 @@
 1
 2
 3
-four
+4
 5
 6
 7

$ git log --no-merges -p -1 file
commit d49613a1d16c9ece551f9a52f56f16a3dae8bebc
Author: Eric Raible <raible@nextest.com>
Date:   Mon Jul 6 16:25:29 2009 -0700

    updated

diff --git a/file b/file
index b033488..b29b605 100644
--- a/file
+++ b/file
@@ -2,7 +2,7 @@
 1
 2
 3
-4
+four
 5
 6
 7

$ git log --no-merges -p -R -1 file
commit d49613a1d16c9ece551f9a52f56f16a3dae8bebc
Author: Eric Raible <raible@nextest.com>
Date:   Mon Jul 6 16:25:29 2009 -0700

    updated

diff --git b/file a/file
index b29b605..b033488 100644
--- b/file
+++ a/file
@@ -2,7 +2,7 @@
 1
 2
 3
-four
+4
 5
 6
 7