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                      ILLUSTRATION                     

GO

  The inode is a 64-byte data structure or record that defines

(characterizes) the file.   We'll try to show you an inode structure

when defined in the C language.  The left column contains data and the

bars on the right represent the relative size of the variables.   

If you are unfamiliar with C, you can skip this graphic.     

 INODE

 In particular an inode contains the mode and type of a file, 

i.e. directory, character, block, special or ordinary:                         

Remember, the data structure appears on the left.  The bars on the    

right represent the relative size of the variables.   

  struct dinode {

 short dimode;             

 The second element is the number of links to the file,      

i.e. the number of times the file appears in the directory.           

 short di_nlink;           

 The third element is the file owner's user identification number.

 short di_uid;             

 The fourth element is the file owner's group identification number. 

 short di_gid;             

 The fifth element is the file length in bytes.                     

 long di_size;                 

 The sixth element contains the file's physical address on the

disk.  It consists of 13 addresses, each 3 bytes in length.  Unused 

addresses are set to 0.  Note that 1 byte is unused.                             

 char di_addr[40];       --------- 40 ------------  

 The seventh element is the time of the last access of the file.              

 long di_atime;                

 The eighth element is the time of the last modification.          

 long di_mtime;                

 The ninth element is the time when the file was created.            

 long di_ctime;                

 };