Permissions problem

[Jonas Norlander]

2010/4/14 NW <barnaby at drofle.com>:
> I have been looking at the possibility of using my one printer for all
> three computers at home, see other thread. Now I don't know if I have
> done anything silly but .....
>
> Yesterday I couldn't print anything. Research tracked down the problem
> to the permissions on dev/lp0. They were  rw-rw---- with user = root and
> group = lp. So others had no permissions.

You shouldn't need to change permissions on devices in /dev. Perhaps
you need to add yourself to a group? On my Kubuntu 9.10 I am in the
lpadmin group (don't know if Hardy using this group).

> I used chmod (with sudo) to change the permissions to rw-rw-rw- and I
> was then able to print. Fine.
>
> Today same problem. The permissions had reverted to rw-rw----. I have
> changed them again. Now I don't want to have to keep running chmod every
> session, that is just silly and anyway it has only just started to happen.
>
> Can anyone help here please? For a start I don't understand why the new
> set of permissions changed back. Shouldn't my change remain fixed?

No they are not permanent. All devices in /dev is dynamically created
at boot or when attaching a new "hot-plug" device like USB devices.

/ Jonas