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#DELETE BRANCHES MERGED INTO CURRENT BRANCH

git branch --merged | egrep -v "(^\*|master|dev|develop)" | xargs git branch -d

How to list only the file names that changed between two commits?

git diff --name-only SHA1 SHA2

where you only need to include enough of the SHA to identify the commits. You can also do, for example

git diff --name-only HEAD~10 HEAD~5