services.4 (2010 09)

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services(4) services(4)
NAME
services - service name data base
DESCRIPTION
The file
/etc/services
associates official service names and aliases with the port number and proto-
col the services use. For each service a single line should be present with the following information:
<official service name> <port number/protocol name> <aliases>
Port numbers 0 through 1023 are assigned by RFC 1700. This RFC also lists the conventional use of vari-
ous ports with numbers greater than 1023.
Aliases are other names under which a service is known. Library routines such as getservbyname()
can be invoked with a service alias instead of the service official name. For example:
shell 514/tcp cmd
In this example, getservbyname()
can be invoked with cmd instead of
shell:
sp = getservbyname("cmd", "tcp");
instead of
sp = getservbyname("shell", "tcp");
Both produce the same results.
A line cannot start with a space or tab. Items are separated by any number of blanks (space or tab char-
acters in any combination). The port number and protocol name are considered a single item .A
/ is
used to separate the port and protocol (for example,
512/tcp). A # character indicates the beginning of
a comment. Characters from the # to the end of the line are not interpreted by routines which search the
file.
Service names can contain any printable character other than a white space, newline, or comment charac-
ter. Trailing blanks (spaces or tabs) are allowed at the end of a line.
Not all services listed in this file are available on HP-UX.
EXAMPLES
shell 514/tcp cmd
telnet 23/tcp
login 513/tcp
AUTHOR
services was developed by the University of California, Berkeley.
FILES
/etc/services
SEE ALSO
getservent(3N).
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1