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For computer log management, the Common Log Format,[1] also known as the NCSA Common log format,[2] (after NCSA HTTPd) is a standardized text file format used by web servers when generating server log files.[3] Because the format is standardized, the files can be readily analyzed by a variety of web analysis programs, for example Webalizer and Analog.
Each line in a file stored in the Common Log Format has the following syntax:
host ident authuser date request status bytes
The format is extended by the Combined Log Format with referer and user-agent fields.
^"Logging in W3C httpd". World Wide Web Consortium. 1995-10-12. Retrieved 2015-04-16.
^"Log File Formats: NCSA Common". IBM. 2004-05-19. Archived from the original on 2021-02-24. Retrieved 2013-05-07.
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