Best way to replace a binary

[darkfinger]

Hi
I am making changes to some code but feel nervous about rebuilding the entire code base. Is there a best practice on how to change a binary, perhaps by copying it from jffs at boot? Btw it's code for wan dhcp.

Many thanks

Dave

 

[ryzhov_al]

Just as an example:

cp -r /usr/ /tmp
mount -o bind /tmp/usr /usr

Now you can change any binary in /tmp/usr, all changes will be reflected at /usr.