gistfile1.txt

    NSString *currentDir = [[[NSBundle mainBundle] bundlePath] stringByDeletingLastPathComponent];
    NSTask *task = [[NSTask alloc] init];
    [task setLaunchPath: @"/usr/bin/java"];
    [task setCurrentDirectoryPath:currentDir];
    [task setArguments:[NSArray arrayWithObjects:[NSString stringWithFormat:@"-Xmx%dM", [RamTextField intValue]], [NSString stringWithFormat:@"-Xms%dM", [RamTextField intValue]], @"-jar", [NSString stringWithFormat:@"%@/minecraft_server.jar", currentDir], nil]];
    NSPipe *pipe = [NSPipe pipe];
    [task setStandardError: pipe];//Return Error only
    [task setStandardInput:[NSPipe pipe]];
    NSFileHandle *file = [pipe fileHandleForReading];    
    [task launch];   
    NSData *data = [file readDataToEndOfFile];    
    NSString *output = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
    NSLog (@"script returned: %@", output);
    if ([self containsString:@"Unable to access jarfile" inThisString:[NSString stringWithFormat:@"%@", output]]){
        NSAlert *msgBox = [[NSAlert alloc] init];
        [msgBox setAlertStyle:2];
        [msgBox setMessageText:@"Unable to find minecraft_server.jar in the current directory."];
        [msgBox runModal];
    }else{
        NSAlert *msgBox2 = [[NSAlert alloc] init];
        [msgBox2 setAlertStyle:1];
        [msgBox2 setMessageText:@"Thanks to Jamesst20 ! Enjoy :)"];
        [msgBox2 runModal];
    }