**********************************************************************
*                             MIX                                    *
**********************************************************************
*                  COPYRIGHT 1983 EUGENE H. MALLORY                  *
**********************************************************************
PROGRAM:
    MIX - MIX pages together into book signature order.
USAGE:
    MIX [<fid] [-Ln] [-Nn] [>fid]
FUNCTION:
    
    This accepts a list of file names from the standard input.  
    File names may not be wildcarded.  Each file is assumed to be
    a page of text.  The pages are output in book signature order.
    Partial pages and missing pages are filled out with blank lines.
    
    Input file names which begin with a $ (i.e. $SPLIT$) are deleted
    as they are used.
    
    -Nn is the number of pages in the signature. This must be at
    least 4 and must be a multiple of 4.
    
    -Ln is the page length.
    
EXAMPLE:
    LS PAGES.* |MIX -L66N16 >TEXT
    SPLIT BOOK -L66 |MIX -L66N16 |2UP -L66W >LST:
    


        Command Line                       

___________________________________  
                                  |  
                                  |  
                                  |  
                                  |  OPTIONS
                                  |                  
                    ______________V______________    
 Standard Input     |                           |   Standard Output
 FILE NAME LIST     |                           |  CONCATENATED TEXT
------------------->|            MIX            |----------------------->
                    |                           | IN SIGNATURE PAGE ORDER
                    |                           |
                    |___________________________|
