Updates Jenkins based upon URL. You will need to change the paths below to fit your deployment.

jenkinsUpdater.sh

#!/bin/bash

# USE LIKE:
# bash jenkinsUpdater.sh "updates.jenkins-ci.org/download/war/2.190.1/jenkins.war"

# Change these locations to suit your needs
BACKUP_ROOT_PATH=/usr/share/jenkins/backups
JENKINS_WAR_PATH=/usr/share/jenkins
DOWNLOAD_ROOT_PATH=~/downloads

URL=$1
CURRENT_DATE=`TZ=America/Chicago date +%m_%d_%Y__%I_%M_%S_%p`
JENKINS_WAR_FILE_PATH=$JENKINS_WAR_PATH/jenkins.war
BACKUP_PATH=$BACKUP_ROOT_PATH/$CURRENT_DATE
DOWNLOAD_PATH=$DOWNLOAD_ROOT_PATH/$CURRENT_DATE


printf "-- CREATING BACKUP PATH: \n    $BACKUP_PATH\n\n"
mkdir $BACKUP_PATH

printf "-- CREATING DOWNLOAD PATH: \n    $DOWNLOAD_PATH\n\n"
mkdir $DOWNLOAD_PATH

printf "-- BACKING UP JENKINS.WAR: \n    $JENKINS_WAR_FILE_PATH \nTO BACKUP PATH: \n    $BACKUP_PATH\n\n"
cp $JENKINS_WAR_FILE_PATH $BACKUP_PATH

printf "-- DOWNLOADING NEW WAR FILE FROM: \n    $URL\n TO:\n    $DOWNLOAD_PATH\n\n"
wget $URL -P $DOWNLOAD_PATH

printf "-- COPYING NEW WAR FILE\n\n"
cp $DOWNLOAD_PATH/jenkins.war $JENKINS_WAR_PATH

printf "-- STOPPING JENKINS\n\n"
systemctl stop jenkins

printf "-- STARTING JENKINS\n\n"
systemctl start jenkins