sudo(8) systemctl restart.8 apache2
execute a command as another user
sudo allows a permitted user to execute a command as the superuser or another user, as specified by the
security policy.  The real and effective uid and gid are set to match those of the target user, as
specified in the password database, and the group vector is initialized based on the group database
(unless the -P option was specified).
init daemon control tool
source manpages: sudorestart