These techniques will find services that have been started at root with the SysV or systemd initialization scripts. However, services may be started manually, or in a boot script, or with xinetd.

The xinetd daemon functions in a similar way to init: it starts services. Unlike init, the xinitd daemon only starts a service when it's requested. For services such as SSH, which are required infrequently and run for a long time once started, this reduces the system load. Services such as httpd that perform small actions (serve a web page) frequently are more efficient to start once and keep running.

The configuration file for xinet is /etc/xinetd.conf. The individual service files are commonly stored in /etc/xinetd.d.

The individual service files resemble this:

# cat /etc/xinetd.d/talk
# description: The talk server accepts talk requests for chatting \
# with users on other systems.
service talk
{
 flags   = IPv4
 disable   = no
 socket_type  = dgram
 wait   = yes
 user   = nobody
 group   = tty
 server   = /usr/sbin/in.talkd
}

A service can be enabled or disabled by changing the value of the disable field. If disable is no, the service is enabled. If disable is yes, the service is disabled.

After editing a service file, you must restart xinetd:

    # cd /etc/init.d
    # ./inetd restart