[knc1]

So you must be using kTerm, otherwise you would have seen the motd that reminds users that the file system is normally read-only.

Sorry, I just assumed you knew that, so:

mntroot rw
change permissions
mntroot ro

= = = = =

*nix systems (all types of them) support symbolic links.
Something DOS based systems do not.

In the case of libraries, they are used to link from a 'common name' (always the same) to the particular name-version named file.
It is the permission of the target of the link(s) that you need to change and then execute that one.