I would like to change the target of symbolic link from within a bash script. The problem is that the symlink is quite important (it's /bin/sh, namely) and I would to do it in fashion that:
- New target will be available immediately after removing old, i.e. there will be no possibility that something will notice disappearing of it,
- There will be no possibility that the change will fail in the middle, i.e. leaving user with symlink removed and no new one.
I thought about two methods. Either using plain ln:
ln -fs /bin/bash /bin/sh
or using mv:
ln -s /bin/bash /bin/sh.new
mv /bin/sh.new /bin/sh
Which one will suit my needs better? Is there any possibility that one of them would try to replace the symlink target instead of symlink itself?