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Service name database (UNIX)




The /etc/services file contains information regarding the known services available in the DARPA Internet. For each service, a single line should be present with the following information:

official_service_name  port_number/protocol_name  aliases

The following is an example from a working services file:

ftp             21/tcp


Is the service name.
Is the port_number.
Is the protocol_name.

Items are separated by any number of blanks or tabs, or both.

The port_number and protocol_name are considered a single item; a / is used to separate the two (e.g. 512/tcp).

A # in a line indicates the beginning of a comment -- any characters after a #, up to the end of the line, aren't interpreted by the routines that search the file.

Service names may contain any printable character other than a field delimiter, newline, or comment character.

See also:


getservent() in the Library Reference

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