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services(4)
NAME
  services - Defines the sockets and protocols used for Internet services

SYNOPSIS
  /etc/services

DESCRIPTION
  The /etc/services file associates Internet service names and aliases with
  the port number and protocol used by the service.  Each service is listed
  in this file on a single line of the form:

       ServiceName  PortNumber/ProtocolName  Aliases

  The fields contain the following information:

  ServiceName
	    The official Internet service name.

  PortNumber/ProtocolName
	    The socket port number used for the service and the transport
	    protocol used for the service.

  Aliases   A list of unofficial service names.

  Items on a line are separated by spaces or tabs.  Comments begin with a #
  (number sign) and continue to the end of the line.

EXAMPLES
  Entries in the /etc/services file for the inetd internal services might
  look like this:

       echo	     7/tcp
       echo	     7/udp
       discard	     9/tcp	sink null
       discard	     9/udp	sink null
       daytime	    13/tcp
       daytime	    13/udp
       chargen	    19/tcp	ttytst source
       chargen	    19/tcp	ttytst source
       ftp	    21/tcp
       time	    37/tcp	timeserver
       time	    37/udp	timeserver

RELATED INFORMATION
  Functions: endservent(3), getservbyname(3), getservbyport(3),
  getservent(3), setservent(3)

  The RFC923 specification.