update a running busybox

[Arno Steffen]

2011/3/29 Ralf Friedl <Ralf.Friedl at online.de>:
> Arno Steffen wrote:
>>
>> How can I exchange a busybox while the system is running? I have to
>> use some kind of update script:
>>
>> #!/bin/sh
>> mount -w -o remount /
>> ...
>> if [ -f busybox ] ; then
>>        chmod 4755 busybox
>>        mv busybox /bin
>> fi
>> ...
>> mount -r -o remount /
>> reboot
>
> You can try
>
> ln /bin/busybox /bin/busybox.old
> mv busybox /bin/busybox
>
> Then remove /bin/busybox.old after the next reboot.
>
> Ralf
>

Thanks for your help. I have tried Ralfs approach and it works. Just
for my understanding (I like to learn more) : can you explain why this
works? This is not very clear to me. But anyhow, thanks both of you
for your answers.

Regards
Arno