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PROTOCOLS(5)                BSD File Formats Manual               PROTOCOLS(5)

     protocols -- protocol name data base

     The protocols file contains information regarding the known protocols used in the DARPA Internet.  For
     each protocol a single line should be present with the following information:

           official protocol name
           protocol number

     Items are separated by any number of blanks and/or tab characters.  A ``#'' indicates the beginning of
     a comment; characters up to the end of the line are not interpreted by routines which search the file.

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

     Processes generally find protocol records using one of the getprotoent(3) family of functions.  On Mac
     OS X, these functions interact with the DirectoryService(8) daemon, which reads the /etc/protocols file
     as well as searching other directory information services to determine protocol name and number infor-mation. information.


     getprotoent(3), DirectoryService(8)

     The protocols file format appeared in 4.2BSD.

4.2 Berkeley Distribution        June 5, 1993        4.2 Berkeley Distribution

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