Returns the N biggest git refs

gitbig.sh

#!/bin/bash
# USAGE: gitbig N - returns the N biggest git refs (default N is 10).
#
# Note that to remove these refs you will need to rewrite the
# commit history. See https://confluence.atlassian.com/bitbucket/reduce-repository-size-321848262.html
# for more information.

if (( `find .git/objects/pack -name *.idx | wc -l` > 1 )); then
    git gc --aggressive --prune=now
fi

INDEX=`find .git/objects/pack -name *.idx`

echo -e "Searching index `basename $INDEX` for top ${1:-10} biggest files...\n"

PACKS=`git verify-pack -v $INDEX | sort -k 3 -nr | head -${1:-10}`
FILES=`echo "$PACKS" | awk '{print $1}'`
SIZES=`echo "$PACKS" | awk '{print $3}'`
ARRSIZES=($SIZES)
i=0

for f in $FILES; do
    FILE=`git rev-list --objects --all | grep $f`
    echo "`numfmt --to=iec-i --suffix=B --padding=7 ${ARRSIZES[$i]}` $FILE"
    i=$i+1
done

To install:

wget -O ~/gitbig https://gist.githubusercontent.com/fernandrone/b036d970e9a9694feea2c62d6714300d/raw/d94453417cfcf0d4993988189a97ebc40d5338e0/gitbig.sh
chmod +x ~/gitbig
sudo mv ~/gitbig /usr/local/bin/gitbig