How to share/delete the records through Apex?

Hope this will help to share records using Apex:-

public class JobSharing {

public static boolean manualShareRead(Id recordId, Id userOrGroupId){
// Create new sharing object for the custom object Job.
Job__Share jobShr = new Job__Share();

// Set the ID of record being shared.
jobShr.ParentId = recordId;

// Set the ID of user or group being granted access.
jobShr.UserOrGroupId = userOrGroupId;

// Set the access level.
jobShr.AccessLevel = 'Read';

// Set rowCause to 'manual' for manual sharing.
// This line can be omitted as 'manual' is the default value for sharing objects.
jobShr.RowCause = Schema.Job__Share.RowCause.Manual;

// Insert the sharing record and capture the save result.
// The false parameter allows for partial processing if multiple records passed
// into the operation.
Database.SaveResult sr = Database.insert(jobShr,false);

// Process the save results.
if(sr.isSuccess()){
// Indicates success
return true;
}
else {
// Get first save result error.
Database.Error err = sr.getErrors()[0];

// Check if the error is related to trival access level.
// Access level must be more permissive than the object's default.
// These sharing records are not required and thus an insert exception is acceptable.
if(err.getStatusCode() == StatusCode.FIELD_FILTER_VALIDATION_EXCEPTION &&
err.getMessage().contains('AccessLevel')){
// Indicates success.
return true;
}
else{
// Indicates failure.
return false;
}
}
}

}

To delete records try this:-

global class deleteSubscribers implements Database.Batchable<sObject>{
global final String Query;
global deleteSubscribers(String q){
Query=q;
}

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

global void execute(Database.BatchableContext BC,List<Subscriber__c> scope){
delete scope;
}

global void finish(Database.BatchableContext BC){}
}