Question

I am working on a git repository which contains huge number of files changed b/w one commit to another, how to extract the number of files changes b/w commits.

Answer 1

EDIT: "this will always count the files plus one, cause the --format=oneline includes the commit-hash/header" as mentioned by c00kiemon5ter

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The git whatchanged tool shows you a summary of files that were modified. By itself it lists all commits, but you can also limit it to just the recent n commits:

git whatchanged -1

To count files:

git whatchanged -1 --format=oneline | wc -l

See git help whatchanged for details.