let's see simple example:

you can use following command to all seeders in laravel application:
***************************
   php artisan db:seed
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you have to register all seeder in DatabaseSeeder.php file and that will run all seeders at a time, register as like bellow:

database/seeders/DatabaseSeeder.php

call([
            UserSeeder::class
            AdminSeeder::class
        ]);
    }
}