How to execute a sudo command in a script

The -S option for sudo makes sudo read the password from stdin instead of prompting. So it would look something like:

echo 'password' | sudo -S thecmd


Another option is to modify /etc/sudoers to specify NOPASSWD for certain users. Edit /etc/sudoeres with visudo. Then add the line

username ALL=(ALL) NOPASSWD: ALL

where username is the user to set.