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 Documented in Volume 1 of the UNIX Programmers Manual.

 % file *
  attempts to guess (for each file in the current directory) the 
  format of each file specified, and lists to the standard output 
  something like this:

  ar11:		demand paged pure executable
  helpr:	cannot open
  demodb:	commands text
  f77:		pure executable
  lint:		c program text
  telnet:	demand paged pure executable not stripped
  Articl:	empty
  bin:		directory
  mbox:		ascii text
  z.c:		c program text
  author:	roff, nroff, or eqn input text
  bernet:	English text

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