问git命令(或简单脚本)来获取文件的前(旧)和后(新)副本

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# Create a directory named "new" and copy all files of interest into it. This assumes
# you are already on your more-recent, or "new" commit.
mkdir new
cp path/to/file1.c new
cp path/to/file2.c new
cp path/to/file3.c new

# Check out the "old" version of the files from the previous_commit_hash,
# make an "old" dir for them, and copy them into it.
git checkout previous_commit_hash -- path/to/file1.c path/to/file2.c path/to/file3.c
mkdir old
cp path/to/file1.c old
cp path/to/file2.c old
cp path/to/file3.c old

# Checking out the above files automatically stages them for commit, for some reason,
# so unstage them with `git reset`
git reset

# Check out the new files again from HEAD so you are back where you started. 
# This causes the newer versions of these files to again be checked out and to 
# overwrite the older versions of these files you had just checked-out above.
git checkout -- path/to/file1.c path/to/file2.c path/to/file3.c

# Package up the "new" and "old" directories into a "files.zip" zip file to send
# to a friend to look at on their end with their favorite difftool
# or merge tool, such as meld or whatever!
zip -r files.zip old new

# When done, run `git status` to see that you have 2 new directories plus the new
# .zip file.
git status

rm -r files.zip old new