Similar with standard Unix tools:
split -b 1G bigfile.bin bigfile-parts
cat bigfile-parts* > bigfile2.bin
md5sum bigfile.bin bigfile2.bin
37c58141654fd66d9efb73b8a33177b6 bigfile.bin
37c58141654fd66d9efb73b8a33177b6 bigfile2.bin
[flagged]