Using split and cat in linux

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Cutting:
split -b sizetocut filename prefixfilename_


e.g:


split -b 20480k demo.zip demo_


make : demo_aa , demo_ab ..


joining file:


cat file1 file2 ... > newfile
or
cat prefixfilename_* > newfile
e.g:
cat  demo_*  > demo.zip

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