File (information)

Definition and stakes

John Goerzen,  Debian GNU/Linux : Guide to Installation and Usage

“ The proc filesystem contains information about the system and running processes. Some of the “files” in /proc are reasonably understandable to humans (try typing cat /proc/meminfo or cat /proc/cpuinfo) ; others are arcane collections of numbers. Often, system utilities use these to gather information and present it to you in a more understandable way.
People frequently panic when they notice one file in particular— /proc/kcore —which is generally huge. This is (more or less) a copy of the contents of your computer’s memory. It’s used to debug the kernel.
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Source: Gutenberg

The Jargon File, Version 4.0.0…

“ These include, among other things, the X.400 email standard and the Group 1 through 4 fax standards. See also {{book titles}}.
:green bytes: /n./ (also `green words') 1. Meta-information embedded in a file, such as the length of the file or its name; as opposed to keeping such information in a separate description file or record. The term comes from an IBM user's group meeting (ca. 1962) at which these two approaches were being debated and the diagram of the file on the blackboard had the `green bytes' drawn in green. 2. By extension, the non-data bits in any self-describing format.
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Source: Gutenberg

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