Linux/unix split large file and concatenate

Split large file into small ones

split -b 1024m "YourFile.iso" "YourFile.iso."

Concatenate it back

cat YourFile.iso.* > YourFile.iso

It works on both linux and unix. Since MAC is based on unix so it works on MAC as well and between mac to linux.

Reference

[1]https://superuser.com/questions/362177/how-to-split-big-files-on-mac