Intro, intro - introduction to file formats


     This section outlines the formats of various  files.  The  C
     structure  declarations for the file formats are given where
     applicable. Usually, the headers containing these  structure
     declarations can be found in the directories /usr/include or
     /usr/include/sys. For inclusion in C language programs, how-
     ever,   the   syntax   #include   <filename.h>  or  #include
     <sys/filename.h> should be used.

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