This is what I plan to do:


sudo -i <<'EOF'
iptables-save | awk '/^[*]/ { print $1 } 
                 /^:[A-Z]+ [^-]/ { print $1 " ACCEPT" ; }
                 /COMMIT/ { print $0; }' | iptables-restore

I will save the above and call it cleariptables.sh. I will set it as executable.

It will be placed in a folder called bin in the following path: /home/cymbal/bin/

(where cymbal is the username)

I will create a shortcut to cleariptables.sh on the desktop. The contents of the shortcut will be:

[Desktop Entry]
Exec=gksudo /home/cymbal/bin/cleariptables.sh
Comment[en_US]=Flush iptables filters
Comment=Flush iptables script

Whenever I click on the desktop shortcut, I will be prompted to enter the password and the script will run.

Question: Clicking on the desktop shortcut prompts me for the password. As there is a sudo -i in the script, will I be prompted again for the password?


You can use NOPASSWD directive in your sudoers file.

Add this line to your /etc/sudoers file

your_login ALL = (root) NOPASSWD: /path/to/your/script

When editing this file, you should use the visudo command instead of a regular text editor. This will check for syntax errors before saving your changes.

  • Thanks for the tip. What does your_login represent? Is it my username? – user66229 May 25 '14 at 22:48
  • 1
    Yes it is cymbal – Slyx May 26 '14 at 2:44
  • Thanks for the clarification. Now, if I add your recommended line to my /etc/sudoers file, will my username become root from that point onwards? I do not want that to happen. During Debian installation, I expressly chose not to allow log in as root. – user66229 May 26 '14 at 3:48
  • 1
    No ! Only the given command is run as root. It's not a root login ! – Slyx May 26 '14 at 3:52
  • 1
    But any files by your script, will have the root as owner :-) – Slyx May 26 '14 at 3:56

No, you should not be prompted for a password again. The script will be running as root due to the gksudo. In my experience, sudo never asks for password if you are already root (although I couldn't find this explicitly documented).

  • You are right. I was not prompted for a password again. – user66229 May 26 '14 at 16:53

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.