Dear All,

Is there a way to convert long decimal int value to 4-bytes, using Bourne Shell or any commands from minimal Linux (sed, awk, etc)?
The goal is to calculate size of file and place the 4-byte value before it. I.e:

#!/bin/sh
size=`du filename`
cat <convert $size to 4 bytes> filename >filename

Appreciate your help.

UPD: i have found a part of solution:
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