I wanted to follow this guide to avoid typing a password every time I want to use "sudo iwconfig" command

http://ubuntuforums.org/showthread.php?t=1132821

I tried the steps with "apt-get" command and it worked

sudo select-editor

sudo visudo

add %admin ALL=(ALL)NOPASSWD:/usr/bin/apt-get to the bottom line

but they didn't work with "iwconfig"

I believe the reason behind that is "iwconfig" source files are not stored in "/usr/bin/" directory because ls /usr/bin/ | less doesn't show anything named iwconfig

So, what is the directory I should enter before iwconfig?

Thanks in advance