Launch + cron for jenkins slave in screen mode

crontab

*/1 * * * * /var/lib/jenkins/jenkins.sh

jenkins.sh

#!/bin/sh

# make sure Launch method, Internal data directory using websocket

slave_1='slave_1'
slave_2='slave_2'
slave_3='slave_3'
slave_4='slave_4'
slave_5='slave_5'

if ps ax | grep -v grep | grep $slave_1
then
    echo "$slave_1 is running..."
else
    echo "$slave_1 not running, relaunching..."
    cd ~ && screen -S $slave_1 -dm bash -c "java -jar agent.jar -jnlpUrl https://jenkins.example.com/computer/slave_1/slave-agent.jnlp -secret SECRET_KEY_THAT_CREATED_IN_NODES_SLAVE_1 -workDir /var/lib/jenkins/slave_home/slave_1"
fi

if ps ax | grep -v grep | grep $slave_2
then
    echo "$slave_2 is running..."
else
    echo "$slave_2 not running, relaunching..."
    cd ~ && screen -S $slave_2 -dm bash -c "java -jar agent.jar -jnlpUrl https://jenkins.example.com/computer/slave_2/slave-agent.jnlp -secret SECRET_KEY_THAT_CREATED_IN_NODES_SLAVE_2 -workDir /var/lib/jenkins/slave_home/slave_2"
fi

if ps ax | grep -v grep | grep $slave_3
then
    echo "$slave_3 is running..."
else
    echo "$slave_3 not running, relaunching..."
    cd ~ && screen -S $slave_3 -dm bash -c "java -jar agent.jar -jnlpUrl https://jenkins.example.com/computer/slave_3/slave-agent.jnlp -secret SECRET_KEY_THAT_CREATED_IN_NODES_SLAVE_3 -workDir /var/lib/jenkins/slave_home/slave_3"
fi

if ps ax | grep -v grep | grep $slave_4
then
    echo "$slave_4 is running..."
else
    echo "$slave_4 not running, relaunching..."
    cd ~ && screen -S $slave_4 -dm bash -c "java -jar agent.jar -jnlpUrl https://jenkins.example.com/computer/slave_4/slave-agent.jnlp -secret SECRET_KEY_THAT_CREATED_IN_NODES_SLAVE_4 -workDir /var/lib/jenkins/slave_home/slave_4"
fi

if ps ax | grep -v grep | grep $slave_5
then
    echo "$slave_5 is running..."
else
    echo "$slave_5 not running, relaunching..."
    cd ~ && screen -S $slave_5 -dm bash -c "java -jar agent.jar -jnlpUrl https://jenkins.example.com/computer/slave_5/slave-agent.jnlp -secret SECRET_KEY_THAT_CREATED_IN_NODES_SLAVE_5 -workDir /var/lib/jenkins/slave_home/slave_5"
fi