How can you concatenate two huge files with very little spare disk space? [closed]

Answer 1

you could do this:

head file2 --bytes=1024 >> file1 && tail --bytes=+1024 file2 >file2 

you can increase 1024 according to how much extra disk space you have, then just repeat this until all the bytes have been moved.

This is probably the fastest way to do it (in terms of development time)