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Command: services | Section: 5 | Source: OpenBSD | File: services.5
SERVICES(5) FreeBSD File Formats Manual SERVICES(5)
NAME
services - service name database
DESCRIPTION
The services file contains information regarding the known services
available in the Internet. For each service, a single line should be
present with the following information:
official service name
port number
protocol name
aliases
Items are separated by any number of blanks and/or tab characters. The
port number and protocol name are considered a single item; a slash (`/')
is used to separate the port and protocol (e.g., "512/tcp").
A hash mark (`#') indicates the beginning of a comment; subsequent
characters up to the end of the line are not interpreted by the routines
which search the file.
Service names may contain any printable character other than a field
delimiter, newline, or comment character.
To protect service ports from being used for dynamic port assignment,
rc(8) reads services at boot and uses the contents to populate
net.inet.tcp.baddynamic and net.inet.udp.baddynamic.
While it is the policy of IANA to assign a single well-known port number
for both TCP and UDP, to avoid reducing the dynamic port range
unnecessarily, the unused entries are not always listed in services.
FILES
/etc/services
SEE ALSO
getservent(3)
HISTORY
The services file format appeared in 4.2BSD.
BUGS
A name server should be used instead of a static file. Lines in
/etc/services are limited to BUFSIZ characters (currently 1024). Longer
lines will be ignored.
FreeBSD 14.1-RELEASE-p8 May 5, 2021 FreeBSD 14.1-RELEASE-p8