Git: Find duplicate blobs (files) in this tree

Question

This is sort of a follow-up to this question.

If there are multiple blobs with the same contents, they are only stored once in the git repository because their SHA-1\'s

Answer 1

For Windows / PowerShell users:

git ls-tree -r HEAD | group { $_ -replace '.{12}(.{40}).*', '$1' } | ? { $_.Count -gt 1 } | select -expand Group

This outputs something like:

100644 blob 8a49bcbae578c405ba2596c06f46fabbbc331c64    filename1
100644 blob 8a49bcbae578c405ba2596c06f46fabbbc331c64    filename2
100644 blob c1720b20bb3ad5761c1afb6a3113fbc2ba94994e    filename3
100644 blob c1720b20bb3ad5761c1afb6a3113fbc2ba94994e    filename4