RepoDir=~/.cocoapods/repos
BackupDir=~/.cocoapods/backup
Names=(spec1 specs2)

cd $RepoDir

for spec in spec
cd $spec
git pull
sleep 1
cd ..

echo "backup spec to backup: "$spec

mv spec spec

done

pod repo update

for spec in ${Names[@]}

do

echo "reback spec to backup: "$spec

mv spec spec

done