Write a Shell Script to check Service Status Check And start If It’s Not Running

#Shell Script to check Service Status Check And start If It’s Not Running
#!/bin/bash

    if [ "$#" = 0 ] # check if service name passed to script as argument, if there no arguments (0) do next

    then
    echo “Usage $0 ” #write to terminal usage

    exit 1 #since no arguments – we need to exit script and user re-run it

    fi

    service=$1 #get service name from first argument

    is_running=`ps aux | grep -v grep| grep -v “$0″ | grep $service| wc -l | awk ‘{print $1}’` #this check
    #if service running using ps command, after we remove our process from output, since script will also
    # match, with wc we count number of matching lines .

    if [ $is_running != "0" ] ; # is number of lines are not 0 do next

    then

    echo “Service $service is running” #just put this line to terminal

    else #if number of precesses is 0

    echo “Service $service is not running” #just put this string to terminal

    initd=`ls /etc/init.d/ | grep $service | wc -l | awk ‘{ print $1 }’` #checking for files in /etc/init.d
    #(directory with start-up scripts) with name similar to service

    if [ $initd = "1" ]; #if there is script with similar name

    then
    startup=`ls /etc/init.d/ | grep $service` # this line get name of startup script (ls –
    # lists files in directory

    echo -n “Found startap script /etc/init.d/${startup}. Start it? Y/n ? ” #just put to
    #terminal this line

    read answer #waiting for user answer

    if [ $answer = "y" -o $answer = "Y" ]; #if answer Y or y

    then
    echo “Starting service…”

    /etc/init.d/${startup} start # running startup script

    fi #exit of if loop

    fi #exit of if loop

    fi#exit of if loop

Results

    server:~/$ ./service.sh apparmor
    Service apparmor is not running
    Found startap script /etc/init.d/apparmor. Start it? Y/n ? Y
    Starting service…
    * Starting AppArmor profiles [OK]