Prune Git Repository

git_file_prune.sh

#!/usr/bin/env bash

FILE="$1"

git filter-branch --index-filter "git rm --cached --ignore-unmatch $FILE" --prune-empty --tag-name-filter cat -- --all
git for-each-ref --format="delete %(refname)" refs/original | git update-ref --stdin
git reflog expire --expire=now --all
git gc --prune=now

git_files_and_sizes.sh

#! /bin/sh

# get temporary file to hold viewed object hashes
TF=$(mktemp)
trap "rm -f $TF" 0 1 2 3 15

BIG=100000  # files up to (and including?) this size are not-big

git rev-list --all --topo-order --reverse |
while read commithash; do
    git ls-tree -r $commithash |
    while read mode type objhash path; do
        [ $type == blob ] || continue      # only look at files
        blobsize=$(git cat-file -s $objhash)
        [ $blobsize -le $BIG ] && continue # or -le
        # found a big file - have we seen it yet?
        grep $objhash $TF >/dev/null && continue
        echo "$blobsize byte file added at commit $commithash as $path"
        echo $objhash >> $TF # don't print again under any path name
    done
done