Jenkins auto-install bash shell for ubuntu

#!/usr/bin/env  bash
# jenkins install bash shell

success_or_fail(){
 if [[ $? == "0" ]]
 then
   echo success of job $1
 else
   echo failed of $1
   exit 1
 fi
}
wget -q -O - http://pkg.jenkins-ci.org/debian-stable/jenkins-ci.org.key | sudo apt-key add -
success_or_fail key_add
echo "deb http://pkg.jenkins-ci.org/debian-stable binary/" >> /etc/apt/sources.list.d/official-package-repositories.list
success_or_fail apt-source-add
sudo apt-get update
success_or_fail apt-update
sudo apt-get install -y jenkins
success_or_fail jenkins