Command Substiution:

Define the data of a variable using command output

Syntax : var=$(commands)

Ex: DATE=$(date +%F)

echo %$DATE

Arithimatic Substution:

Define data of a variable using arithematic operators

+ -> addition

- -> Subtraction

* -> Multi

/ -> Div

% -> Reminder

Syntax: var=$(( expression ))

Ex: ADD=$((10+20))

wet http://10.128.0.7/svn/adin/new --user=$username --password=$password -O /tmp/out1

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Backup in Jenkins

1) Login to Jenkins -> Manage Jenkins -> Plugins > (search) backup

2) Select backup plugin and then install and restart

3) Manage jenkins -> backup Manager -> Setup

Backup Directory : /backup

select all data to backup

4) Loguin to server using ssh

mkdir /backup

chown jenkins /backup

5) Manage Jenkins -> Backup Manager -> Backup Hudson Configuration

Restoring in Jenkins

1) Shutdown Jenkins

2) Move jenkins home directory

mv /var/lib/jenkins /var/lib/old_jenkins

3) Extract the backup.

cd /var/lib

mkdir jenkins

cd jenkins

tar xzf /backup/backup.tar.gz

chown jenkins:jenkins /var/lib/jenkins -R

4) Start Jenkins

wget -O file.war "http://172.31.6.196:8081/nexus/service/local/artifact/maven/redirect?r=snapshots&g=org.javaee7.sample&a=javaee7-simple-sample&v=LATEST&p=war"