Hi,
    great thanks for your attention,
Yes, git log --oneline --format %H --follow -- hello.txt is better than using awk.


git log --oneline --format %H --follow -- hello.txt \
    | while read name; do
      git difftool "$name" "$name^1"
    done

Unfortunately, if you observe carefully, you will soon find that *_it skipped some commits_*. I strongly doubt the fault is the ^ git operator. My solution is using an array to save the output first: see my script bellow:

    commits=( $(git log --oneline --format=%H --follow -- "$1") )
for (( i=0; i<${#commits[@]}; i++ )); do echo ${commits[i]};git difftool ${commits[i]}^! "$1"; done


On 7/29/15 5:21 AM, Konstantin Khomoutov wrote:
On Tue, 28 Jul 2015 13:30:56 -0700
Ying Huang <huangyi...@gmail.com> wrote:

   Hi, I am trying to visually show a file change history.
   I have a file, named hello.txt, and 3 commits on it, they are:

_ 1b0e691e55caa8fd2b5dd6902f77c406fb68e648__
__ d058c095f7e98a7ebe943c18f87ef087c723bb9f__
__ c4d1769183ab6d852c624e71e6a0ca00dc3b6d13__
_
   Please note: they might not be continuous.
   The way to find all the commits on this file is by following
command: _git log --follow hello.txt|awk '/commit/{print $2}'_
This can be done without awk:

   git log --oneline --format %H --follow -- hello.txt

   Now, I want to show every visual diff of the 3, against their
respective parent.
   git difftool <sha1> <sha1>^1

should do that, meaning "run the configured difftool to show the
difference between the commit at <sha1> and the commit which is the
first (left) or the sole parent of thatc commit".

   Let's take 1b0e691e55caa8fd2b5dd6902f77c406fb68e648 as example:
   The following command will give me a view on the commit details on
this file, and since I have configured kdiff3 as the difftool, so it
will pop up a kdiff3 windows to display the differences.
_ git difftool 1b0e691e55caa8fd2b5dd6902f77c406fb68e648^! hello.txt_
   So, I continue to use a while loop to try to see all the 3 commits
diff view
_ git log --follow hello.txt|awk '/commit/{print $2}'|while read ss;
do git difftool $ss^! hello.txt; done_
OK, so I'd rephrase this like

   git log --oneline --format %H --follow -- hello.txt \
     | while read name; do
       git difftool "$name" "$name^1"
     done

Please read the gitrevisions manual page on that <rev>^n notation
(run `git help revisions`).

--
Best Regards,

Ying

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