Reproduction recipe for [How do you tell git to permanently ignore changes in a file?][1] [1]: http://stackoverflow.com/a/14370990/7355

gistfile1.sh

#!/bin/sh
set -v
set -e

rm -rf repro
mkdir repro
cd repro
git init
touch a b
git add --all
git commit --message "initial commit"
echo "this change on master" > b
git status
git update-index --assume-unchanged b
git status
git checkout -b test
git status
cat b
git checkout master
git status
cat b

@francois This is cool. Thanks. Is there a way that I can get a list of the 'assume-unchanged' files? I may forget which file I 'assume-unchanged' weeks later.