Re: What's the difference between `git show branch:file | diff -u - file` vs `git diff branch file`?

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Nguyen Thai Ngoc Duy <pclouds <at> gmail.com> writes:
>  - is "file" above at top repo, or is it actually very/deep/path/to/a/file?
3 levels deep. Most parent dir (one after repo root) contains 20k files.

>  - how many entries in the tree that contain "file"?
Sorry, didn't understand this.

>  - how is "git ls-files | wc -l"?
$ time git ls-files | wc -l
603137

real    0m0.417s
user    0m0.440s
sys     0m0.060s

>  - how about "time git diff branch another-branch -- file >/dev/null"?
> That'd remove unpack-trees code.
Pretty fast:
$ time git diff branch:file other_branch:file > /dev/null

real    0m0.278s
user    0m0.210s
sys     0m0.060s

One more test:
git diff HEAD branch -- file > /dev/null 

real    0m0.276s
user    0m0.240s
sys     0m0.030s

So the only troubled variant is `git diff branch -- file`.

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