services(4)

NAME

services − service name data base

DESCRIPTION

The file /etc/services associates official service names and aliases with the port number and protocol the services use. For each service a single line should be present with the following information:

<official service name> <port number/protocol name> <aliases>

Reserved port numbers 0 through 255 are assigned by RFC 1010.

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 characters 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 character. Trailing blanks (spaces or tabs) are allowed at the end of a line.

EXAMPLES

shell           514/tcp   cmd
telnet          23/tcp
login           513/tcp

AUTHOR

services was developed by the University of California, Berkeley.

FILES

/etc/services

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