git create patch chain for unpushed commits

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ahead branch chain commit create diff git patch

#!/bin/bash

branch=$(git branch --format='%(refname)')
ahead=$(git for-each-ref --format="%(upstream:track,nobracket)" "$branch" | awk '/ahead/{print$2}')
commits=($(git log --no-show-signature --pretty=format:%H | head -n $ahead | tac))
n=0
printf "%s\n" "${commits[@]}" |
while read c
do
	((++n))
	git show --no-show-signature --patch-with-stat $c > $n-$c.patch
done