EXTRACT - Extract section of file

   The EXTRACT utility reads a file,  and writes a specified range of
lines to standard output,  which can be re-directed to  another  file
with the '>' operator.  If the specified ending line number is higher
than the number of lines in the file,  all lines  from  the  starting
line number to the end of the file will be written.

   The form of the EXTRACT command is:

            EXTRACT <filename> <start line> <end line>

   Examples:

     extract bigfile.dat 1 1000 >small1.dat
     extract bigfile.dat 1001 2000 >small2.dat
     extract bigfile.dat 2001 9999 >small3.dat
