How to write file into another

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http://unix.stackexchange.com – I have an empty file (only zeroes are in it) of size 9,0KB and I need to write another file (with size 1,1KB) to it, but the first file must not lose it's. So if the whole file is 00000000000000... now, I need to write second file in it and leave the zeroes as they are. I have tried to use dd, but I haven't succeed - file resizes. dd if=out/one.img of=out/go.img Does anybody know how can I do it? (HowTos)