Re: How to run automatically a script as soon root login

[Greg Wooledge <greg@wooledge.org>]

On Mon, May 13, 2024 at 01:48:25PM +0200, Mario Marietto wrote:
> I wouldn't to login as root automatically,but I've realized that this
> command :
> 
> echo 1 > /proc/sys/net/ipv4/ip_forward
> 
> work only if I'm root. It does not work using sudo. So,in the end I've
> chosen to be root instead of a normal user that can use sudo.

Aha!  Classic X-Y problem.

To do this with sudo, you can use a shell:

    sudo sh -c 'echo 1 > /proc/sys/net/ipv4/ip_forward'

However, this particular setting can also be done with sysctl:

    sudo sysctl -w net.ipv4.ip_forward=1

Or if you just want the setting to be made permanent, edit the
/etc/sysctl.conf file, find the line that says:

    # Uncomment the next line to enable packet forwarding for IPv4
    #net.ipv4.ip_forward=1

and remove the # sign in front of net.ipv4.ip_forward=1 and then you
will never have to issue your command manually again.