Update all folders which are a valid git repository and create a tar ball (package.tar)

update-n-backup.sh

#!/bin/bash
BACKUP_FOLDER=tmp-bkp

echo "=> Creating temp backup folder..."
mkdir -p $BACKUP_FOLDER
for f in *; do
  if [[ -d $f ]]; then
    echo "=> Updating $f..."
    cd $f
    if [ -d .git ]; then
      git clean -df
      git checkout -- .
      git checkout master
      git pull
      echo "=> Creating a package for $f..."
      git archive --format zip --output "../$BACKUP_FOLDER/$f.zip" master -0
    fi
    cd ../
  fi
done
echo "=> Creating final package..."
tar -cvf package.tar $BACKUP_FOLDER
rm -fr $BACKUP_FOLDER