Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

on OSX I do

sudo route delete default
sudo route add default

to change my default gateway.

On running a sh file with these I am asked for a password every time. Which I run as


How do I pass my password before hand?

share|improve this question
Instead of passing your password to the script, you could invoke the script with sudo sh or run sudo bash to get a root shell, then run your script from there. Then you won't need sudo in the script. – rob Mar 17 '12 at 21:51

For sudo there is a -S option for accepting the password from standard input. Here is the man entry:

-S          The -S (stdin) option causes sudo to read the password from
            the standard input instead of the terminal device.

This will allow you to run a command like:

echo myPassword | sudo -S ls /tmp
share|improve this answer
The downside is that your password is now in the shell history. – rob Mar 17 '12 at 21:45
@rob You can prevent this pretty easily with the ignorespace trick. – Chad von Nau Mar 16 '13 at 3:29

While it is easiest to simply run the script as root, you could also create a group in the sudoers file that can run the program without a password, and add your username to that group.

I've never done this personally, though, and cannot recommend a specific line to add to your sudoers file.

share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .