3/10/2023 0 Comments Fileutilityan initial part of file is considered and file is to use position-sensitive tests.zero-length files are identified as such.file must be able to determine the types directory, FIFO, socket, block special file, and character special file.if the file cannot be read, or its Unix file type is undetermined, the file program will indicate that the file was processed but its type was undetermined.The Single UNIX Specification (SUS) specifies that a series of tests are performed on the file specified on the command line: The file command has also been ported to the IBM i operating system. The OpenBSD system has its own subset implementation written from scratch, but still uses the Darwin/Zoulas collection of magic file formatted information. It was expanded by Geoff Collyer in 1989 and since then has had input from many others, including Guy Harris, Chris Lowth and Eric Fischer from late 1993 onward its maintenance has been organized by Christos Zoulas. Most major BSD and Linux distributions use a free, open-source reimplementation which was written in 1986–87 by Ian Darwin from scratch. System V brought a major update with several important changes, most notably moving the file type information into an external text file rather than compiling it into the binary itself. The original version of file originated in Unix Research Version 4 in 1973. The file command is a standard program of Unix and Unix-like operating systems for recognizing the type of data contained in a computer file. 1973 ( 1973) as part of Unix Research Vers( 1986) open-source reimplementation
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