Toggle whether a file is changeable or unchangeable in a repo as well as list the unchangeable files.

git-manage-changeable.sh

git-assume-unchangeable () {
 git update-index --assume-unchanged "$@"
}

git-assume-changeable () {
 git update-index --no-assume-unchanged "$@"
}

git-show-unchangeable () {
  git ls-files -v | grep -e "^[hsmrck]"
}