Hi,

Try the below code as reference of calling Batch Class from System Debug:
global class OwnerReassignment implements Database.Batchable<sObject>
{
String query;
String email;
Id toUserId;
Id fromUserId;

global database.querylocator start(Database.BatchableContext BC)
{
return Database.getQueryLocator(query);
}

global void execute(Database.BatchableContext BC, List<sObject> scope)
{
List<Account> accns = new List<Account>();

for(sObject s : scope)
{
Account a = (Account)s;
if(a.Ownerid==fromUserId)
{
a.Ownerid=toUserId;
accns.add(a);
}
}

update accns;
}
global void finish(Database.BatchableContext BC)
{
Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();

mail.setToAddresses(new String[] {email});
mail.setReplyTo('batch@acme.com');
mail.setSenderDisplayName('Batch Processing');
mail.setSubject('Batch Process Completed');
mail.setPlainTextBody('Batch Process has completed');

Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
}
}
Calling through System Debug Log
//user u=[select id,name from user where profile.name='system administrator'];
//system.debug('@@@@@@@@@' +u.name);
//user u2=[select id,name from user where profile.name='Standard User'];
//system.debug('########' +u2.name);
id st='00590000000eb7c';
OwnerReassignment reassign = new OwnerReassignment();
reassign.query='SELECT Id, Name, Ownerid FROM Account WHERE ownerid=\'' + st + '\'';
reassign.email='test@gmail.com';
reassign.fromUserId = '00590000000eb7c';
reassign.toUserId = '00590000000eb7w';
ID batchprocessid = Database.executeBatch(reassign);