/**
 * Database.executeBatch(new BatchTestClass(), 200);
 * */
global class BatchTestClass implements Database.Batchable<sObject>
{
    global  Database.QueryLocator start(Database.BatchableContext con)
    {
        String query ='select Id, Name from User';
        return Database.getQueryLocator(query);
    }
     
    global  void execute(Database.BatchableContext con, List<SObject> scope)
    {
        Integer counter = 1;     
        List<User> usrlist = new List<User>();
        for(User usr : (List<User>)scope)
        {
            usr.Description__c = usr.Name + ' Description_' + counter;
            counter++;
            usrlist.add(usr);
        }
      
        update usrlist;
    }
     
     public void finish(Database.BatchableContext BC) 
     {
        AsyncApexJob a = [SELECT Id, Status, NumberOfErrors,
        JobItemsProcessed,TotalJobItems, CreatedBy.Email
        FROM AsyncApexJob WHERE Id =:BC.getJobId()];
        String UserEmail = 'bhushansingh226@gmail.com';
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        mail.setToAddresses(new String[] {UserEmail});
        mail.setReplyTo('rathore.bhushan22@gmail.com');
        mail.setSenderDisplayName('Batch Processing');
        mail.setSubject('Batch Process Completed');
        mail.setPlainTextBody('Batch Process has completed');
        Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
     }
}

/**
 * Database.schedule('My First Schedule', '0 5 * * * ?', new schduleBatchOfUser())
 * */
global class schduleBatchOfUser implements Schedulable
{
    global void execute(SchedulableContext ctx)
    {
        BatchTestClass p = new BatchTestClass();
        Database.executeBatch(p);
   }   
}

public with sharing class RunScheduleJobService
{
    public static void runScheduleJobProcess()
    {
        System.schedule('Job at 0 minutes', '0 0 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 5 minutes', '0 5 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 10 minutes', '0 10 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 15 minutes', '0 15 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 20 minutes', '0 20 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 25 minutes', '0 25 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 30 minutes', '0 30 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 35 minutes', '0 35 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 40 minutes', '0 40 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 45 minutes', '0 45 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 50 minutes', '0 50 * * * ?', new schduleBatchOfUser());
        System.schedule('Job at 55 minutes', '0 55 * * * ?', new schduleBatchOfUser());
    }
}

RunScheduleJobService.runScheduleJobProcess();