# List commits that have no changes (empty commits)
git rev-list HEAD | while read commitHash; do
    if [ $(git diff-tree --name-status --no-commit-id $commitHash | wc -l) -eq 0 ]; then
        echo $commitHash
    fi;
done

# List commits that have changes, and files changed (non empty commits):

git rev-list HEAD | while read commitHash; do
    git diff-tree --name-status $commitHash
done

#Count empty commits

git rev-list HEAD | while read commitHash; do
    if [ $(git diff-tree --name-status --no-commit-id $commitHash | wc -l) -eq 0 ]; then
        echo '1'
    fi;
done | wc -l

# Count non empty commits

git rev-list HEAD | while read commitHash; do
    if [ $(git diff-tree --name-status --no-commit-id $commitHash | wc -l) -gt 0 ]; then
        echo '1'
    fi;
done | wc -l

# remove all empty commits from the repo

git filter-branch --tag-name-filter cat --commit-filter 'git_commit_non_empty_tree "$@"' -- --all

# clean the refs
git for-each-ref --format="%(refname)" refs/original/ | xargs -n 1 git update-ref -d