sudo apt install apache2
$ sudo httpd -v
OU
$ sudo apache2 -v
$ sudo systemctl start apache2 [No Systemd]
$ sudo service apache2 start [No SysVInit]
$ sudo systemctl enable apache2 [No Systemd]
$ sudo chkconfig apache2 on [No SysVInit]
$ sudo systemctl restart apache2 [On Systemd]
$ sudo service apache2 restart [On SysVInit]
$ sudo systemctl status apache2 [No Systemd]
$ sudo service apache2 status [No SysVInit]
$ sudo systemctl stop apache2 [No Systemd]
$ sudo service apache2 stop [No SysVInit]