File split / merge utility
http://lxsplit.sourceforge.net/

lxSplit is a simple tool for splitting files and joining the splitted files on unix-like platforms, such as Linux, FreeBSD, OpenBSD, etc. It is fully compatible with the HJSplit utility which is available for other operating systems. Splitting is done without compression.

lxSplit can handle large files (>= 4 GB) both when splitting and joining.