split --bytes=1024m bigfile.iso small_file_
That command will split bigfile.iso into files that are 1024 MB in size (1GB) and name the various parts small_file_aa, small_file_ab, etc. You can specify b for bytes, k for Kilobytes and m for Megabytes to specify sizes.
To join the files back together on Linux:
cat small_file_* > joined_file.iso
Similarly to join the split files on a Windows machine, use the copy command:
copy /b small_file_* joined_file.iso
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source:http://linuxpoison.blogspot.com/2008/09/135781757114510.html