[BusyBox] How to update busybox on a running system ?

[Vladimir N. Oleynik]

Steven,
 
> I wonder if someone updates busybox while the system is running using some file
> transfer!?
> 
> A simple ftp upload fails on my machine with "Can't open file: text file is
> busy"
> 
> Even if I don't start a shell there still is "init -> /bin/busybox" running....

This is not busybox specific. You can see this problem for update regular init.
The solution is full equivalent:
1. save to other name
2. remove running file
3. rename to require name
space added after reboot only - init is special process.


--w
vodz