To restart the Apache web server on a UNIX system, you can use the following command:
sudo systemctl restart apache2
This command will restart the Apache web server, which is the service responsible for serving web pages.
If your system is running an older init system (such as SysVinit or Upstart), you can use the following command to restart the Apache service:
sudo service apache2 restart
This command will stop and then start the Apache service.
In some cases, you may need to reload the Apache service instead of restarting it. To do this, use the following command:
sudo systemctl reload apache2
This command will reload the Apache configuration without stopping the service or terminating any active connections.
Note that the exact method for restarting the Apache web server may vary depending on the distribution of UNIX you are using. However, in most cases, the above commands should work.