Am trying to read from a file and write to a number of files based on 
the first 4 letters of the data line.  Therefore, I want to be able to 
write the line:  A0037775830|lkajsdlkfjsaljf;lsakjfdsa;jf to file A003 
*and* append all of the A003 lines as well.  Here is the hack I have 
below, however, produces errors and I know I am missing something 
simple/easy ..... as follows:

#!/usr/bin/ruby -w
File.open("meshdata.txt") do |file|
 while line = file.gets
 a = line
 b = a[0,4]
  File.open(b,"w") do |afile|
   puts a.afile

  end
 end
end

Any/all help in this matter is greatly appreciated.

-Bob-