**Use case**

It prints:
```
ClickHouse has been successfully installed.

Start clickhouse-server with:
 sudo clickhouse start
```

But if clickhouse-server is already running, let's print:
```
ClickHouse has been successfully installed.

Restart clickhouse-server with:
 sudo clickhouse restart
```
{
            fmt::print("Will terminate forcefully.\n", pid);
            if (0 == kill(pid, 9))
                fmt::print("Sent kill signal.\n", pid);
            else
                throwFromErrno("Cannot send kill signal", ErrorCodes::SYSTEM_ERROR);
            
            constexpr size_t num_kill_check_tries = 1000;
            constexpr size_t kill_check_delay_ms = 100;
            for (size_t i = 0; i < num_kill_check_tries; ++i)
            {
                fmt::print("Waiting for server to be killed\n");
                if (!isRunning(pid_file))
                {
                    fmt::print("Server exited\n");
                    break;
                }
                sleepForMilliseconds(kill_check_delay_ms);
            }
            if (isRunning(pid_file))
            {
                throw Exception(ErrorCodes::CANNOT_KILL,
                    "The server process still exists after {} tries (delay: {} ms)",
                    num_kill_check_tries, kill_check_delay_ms);
            }
        }
        return 0;
    }
}
int mainEntryClickHouseStart(int argc, char ** argv)