From MorphOS Library
Join - Joins several files into one bigger file
FILE - file(s) or pattern to match AS - destination filename
Join copies all the listed files, in the order given, to one new file. This destination file cannot have the same name as any of the source files. You must supply a destination file name. The original files remain unchanged. Any number of files can be Joined in one operation.
Example: SYS:> Join Part1 Part2 Part3 AS Textfile