UUMerge Freeware Edition

uuMerge is a command line utility that can be used either to combine
multiple text files into a single text file with a separator line
between the contents of each file; or alternatively to process a
'merged' file ( previously created by uuMerge or other processes ) and
recreate the multiple files.

Files are separated internally with special delimiter line prefixed
by ".ADD NAME=".

This odd choice of delimiters allows the file to be processed by the
IBM mainframe utility IEBUPDTE.

Alternatively, you can use the '-nice' option to create a '>>>>>>>>>>'
delimiter line instead so it looks nicer for printing. You could also
use any text editor to do a global replace of the delimiter text to any
string you wish. However you will not be able to use uuMerge to extract
files at a later point.