Capture all feature branches in Git, update base branch (default `master`), rebase forks on it and, optionally, force push to the central repository.

git-rebase-all-feature-branches.sh

#/usr/bin/env bash

baseBranch=master
if [[ $# -eq 1 ]]; then
  baseBranch=$1
fi

echo "Update the repository..."
git fetch -p
echo

echo "Switch to the $baseBranch branch"
git checkout $baseBranch
# This assumes no one's rewritten the base branch's history in the meantime
git merge
echo

featureBranches=`git branch --no-merged | egrep -v "(^\*|master|dev|gh\-pages)"`

echo "Branches to be rebased:"
echo "$featureBranches"
echo

while read -r branch; do
  git checkout "$branch"
  git rebase # merge remote branch even if its history's been rewritten
  git rebase $baseBranch
  if [[ $? -eq 1 ]]; then
    echo
    echo "Encountered a rebasing issue, exiting"
    exit 1
  fi
  echo
done <<< "$featureBranches"

echo "Publishing your rebased feature branches"
echo
for branch in $featureBranches; do
  echo Do you wish to force push branch "$branch"?
  select answer in "Yes" "No" "Exit"; do
    case $answer in
      Yes )
        git checkout "$branch"
        git push --force-with-lease origin "$branch"
        echo
        break 1
        ;;
      No )
        echo
        echo "In case you wanted to publish this rebased branch manually:"
        echo git checkout "$branch"
        echo git push --force-with-lease origin "$branch"
        echo
        break 1
        ;;
      Exit )
        exit 0
    esac
  done
done

git checkout $baseBranch

exit 0