On Dec 23, 2024, Timothy M Butterworth wrote:

sudo fails with a permission denied error.
tmb@hp-debian:~$ sudo /usr/sbin/iptables-save > /etc/iptables/rules.v4
bash: /etc/iptables/rules.v4: Permission denied

"sudo" only modifies "iptables-save", and not the redirect (it happens
as your user, *before* the invocation of sudo, as I recall).


You'll need something like this, so that rules.v4 is opened as root
rather than your user:
sudo /usr/sbin/iptables-save | sudo tee /etc/iptables/rules.v4




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|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
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--- SoupGate-Win32 v1.05
* Origin: fsxNet Us

On Mon, Dec 23, 2024 at 20:48:12 -0500, Dan Purgert wrote:

On Dec 23, 2024, Timothy M Butterworth wrote:

sudo fails with a permission denied error.
tmb@hp-debian:~$ sudo /usr/sbin/iptables-save > /etc/iptables/rules.v4 bash: /etc/iptables/rules.v4: Permission denied

"sudo" only modifies "iptables-save", and not the redirect (it happens
as your user, *before* the invocation of sudo, as I recall).

Correct. Redirects are done by the shell, not by the command the shell executes. The command inherits the redirection.

You'll need something like this, so that rules.v4 is opened as root
rather than your user:
sudo /usr/sbin/iptables-save | sudo tee /etc/iptables/rules.v4

Or:

sudo sh -c '/usr/sbin/iptables-save > /etc/iptables/rules.v4'

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Hi,

On 23 Dec 2024 at 20:56:14, Greg Wooledge wrote:

On Mon, Dec 23, 2024 at 20:48:12 -0500, Dan Purgert wrote:

On Dec 23, 2024, Timothy M Butterworth wrote:

sudo fails with a permission denied error.
tmb@hp-debian:~$ sudo /usr/sbin/iptables-save > /etc/iptables/rules.v4 bash: /etc/iptables/rules.v4: Permission denied

"sudo" only modifies "iptables-save", and not the redirect (it happens
as your user, *before* the invocation of sudo, as I recall).

Correct. Redirects are done by the shell, not by the command the shell executes. The command inherits the redirection.

You'll need something like this, so that rules.v4 is opened as root
rather than your user:
sudo /usr/sbin/iptables-save | sudo tee /etc/iptables/rules.v4

Or:

sudo sh -c '/usr/sbin/iptables-save > /etc/iptables/rules.v4'

or, in this particular case (untested, just from reading "man
iptables-save"):

sudo /usr/sbin/iptables-save -f /etc/iptables/rules.v4

--
Carles Pina i Estany
https://carles.pina.cat | carles@pina.cat | cpina@debian.org

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