Locate large files in git history - http://stubbisms.wordpress.com/2009/07/10/git-script-to-show-largest-pack-objects-and-trim-your-waist-line/

find-large-files-in-git.sh

#!/bin/bash
#set -x 
 
# Shows you the largest objects in your repo's pack file.
# Written for osx.
#
# @see http://stubbisms.wordpress.com/2009/07/10/git-script-to-show-largest-pack-objects-and-trim-your-waist-line/
# @author Antony Stubbs
 
# set the internal field spereator to line break, so that we can iterate easily over the verify-pack output
IFS=$'\n';
 
# list all objects including their size, sort by size, take top 10
objects=`git verify-pack -v .git/objects/pack/pack-*.idx | grep -v chain | sort -k3nr | head`
 
echo "All sizes are in kB's. The pack column is the size of the object, compressed, inside the pack file."
 
output="size,pack,SHA,location"
for y in $objects
do
    # extract the size in bytes
    size=$((`echo $y | cut -f 5 -d ' '`/1024))
    # extract the compressed size in bytes
    compressedSize=$((`echo $y | cut -f 6 -d ' '`/1024))
    # extract the SHA
    sha=`echo $y | cut -f 1 -d ' '`
    # find the objects location in the repository tree
    other=`git rev-list --all --objects | grep $sha`
    #lineBreak=`echo -e "\n"`
    output="${output}\n${size},${compressedSize},${other}"
done
 
echo -e $output 
#| column -t -s ', '

# To remove a directory use this command:
#git filter-branch --force --index-filter 'git rm --cached --ignore-unmatch -r <directory>' --prune-empty --tag-name-filter cat -- --all
# To remove a file use this command :
#git filter-branch --force --index-filter 'git rm --cached --ignore-unmatch <file>' --prune-empty --tag-name-filter cat -- --all