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intro(4)
NAME
  intro - Introduction to file formats

DESCRIPTION
  This section describes the formats of various include files, program output
  files, and system files.

  Some reference pages in this section may contain suffixes to allow their
  files to exist with those of other reference pages having the same base
  name and section number. When used, suffixes are made up of one to four
  letters. See the man(1) reference page for more information on suffixes.