git-list-big-files

#!/bin/bash

while [[ $# > 0 ]] ; do
    case "$1" in
        --not-in-head)
            NOT_IN_HEAD=true
            ;;
    esac
    shift
done

git rev-list --objects --all \
    | \
    if  [ -n "$NOT_IN_HEAD" ]; then 
        grep -vF --file=<(git ls-tree -r HEAD | awk '{print $3}')
    else 
        cat
    fi \
        | git cat-file --batch-check='%(objecttype) %(objectname) %(objectsize) %(rest)' \
        | sed -n 's/^blob //p' \
        | sort --numeric-sort --key=2 \
        | cut -c 1-12,41- \
        | numfmt --field=2 --to=iec-i --suffix=B --padding=7 --round=nearest