Shell script calls sudo; how do I suppress the password prompt

Question

I am writing a simple shell script which changes the mac address of the network hardware. One of the line is :

sudo ifconfig eth0 hw ether 00:99:99:00:00:00
         


        

Answer 1

Most definitely, if you don't mind making that particular command 'free for use' for that particular user:

See basically my other answer here: Shell script - Sudo-permissions lost over time

The simplest thing that may work is

myuser = NOPASSWD: /sbin/ifconfig

Also, you could sudo an arbitrary command on the same terminal (tty/vty), and sudo will cache the authentication for a while (or until sudo -k), so you may start the script and it will 'remember' the credentials from your earlier sudo invocation. I sometimes do this when composing pipes with sudo (just preceded them with sudo true)