artella's questions

I would like to do the following :

If I login as user ABC via the login screen, do nothing. However if I ssh as ABC, then I want to run a root script, without being prompted for roots password, and without having to store roots password somewhere on the disk.

The motivation for this is outlined in the article in Linux : restricting outgoing on an application basis . Basically, inspired by the article https://unix.stackexchange.com/questions/21650/how-to-restrict-internet-access-for-a-particular-user-on-the-lan-using-iptables , what I want to do is the following :

1)Login as user EFG and use firefox to access the web.

2)ssh into ABC.

3)Upon ssh'ing into ABC, I want to run the a script which emulates "sudo iptables -t mangle -A OUTPUT -o eth0 -m owner --uid-owner 1234 -j DROP" where 1234 is the UID of user ABC

4)Then start using, under the ssh'ed terminal for ABC, all the applications which I do not want to have internet access, whilst still logged in as user EFG, hence allowing me to surf the internet as EFG.

Note I tried messing around the /etc/network/interfaces file, however I had some problems with the computer not being able to start properly if the computer was not connected to the network.

Thanks

I typed :

netstat -atlpvn

and noticed that applications like gedit and python had foreign addresses outside the network (the network being a single computer connected to the internet).

Is there any way for me to restrict which applications are allowed outgoing? For example I would only want firefox to have outgoing connections?

Thanks

Currently I have two directories A/ and B/ which are identical in every respect, with the exception of the timestamps. Therefore if I run the command :

rsync --dry-run -crvv A/ B/

then all files are marked "uptodate", whereas the command :

rsync --dry-run -rvv A/ B/

shows that all files are to be copied over from A/ to B/.

My question is this : given that I know the files are identical (in respect to contents), then is there any way (via rsync or otherwise) to set the timestamps for files in B/ to be identical to the timestamps of the files in A/, without copying over all the files from A/ to B/ ?

Thanks

Is it possible to use rsync to copy files in one direction only?

For example, suppose we have:

left/a.txt

right/a.txt

where the files are initially identical.

If one then modifies right/a.txt, then:

rsync -avv left/ right/

will copy right/a.txt onto left/a.txt.

Is it possible to restrict rsync to only copying from left/ to right/ (i.e. prevent it from copying from right/ to left/)?