check/list services running on server

service command - list running services
service --status-all
service --status-all | grep ntpd
service --status-all | less

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Print the status of any service
To print the status of apache (httpd) service:
service httpd status


List all known services (configured via SysV)
chkconfig --list

List service and their open ports
netstat -tulpn
Turn on / off service
ntsysv
chkconfig service off
chkconfig service on
chkconfig httpd off
chkconfig ntpd on