One Simple Problem

[rezame]

Hi,
I am very new in Linux & Ubuntu. I am trying run below command in ubuntu and get below error:
echo "" > /etc/radiusclient/port-id-map

Error: bash: /etc/radiusclient/port-id-map: Permission denied

I tried sudo echo "" > /etc/radiusclient/port-id-map too, but got same error too.
How to solve that?
Regards,

[hazel]

I suggest you do a ls -l on this file to find out what its permissions are. Doing a sudo doesn't always work immediately because there are some files that have been set not to be writeable by anyone, not even root.

Of course, if you are root, you can get round that by changing the permissions on the file and then writing to it. But be cautious; if this file isn't writeable, there's probably a good reason for it.

[Jonathan183]

The problem is likely to be permissions - you can't redirect output using sudo ...
sudo -s will give you a root shell where you can do what you want ... as with everything linux there are other solutions