I don’t have a Linux system to test on, but this should get you started:
Create a Fixlet with the relevance (so it will become relevant on any computer that hasn’t already copied the file… feel free to add more relevance to further refine the systems):
(name of operating system as lowercase contains “linux”) AND (not exists file “/etc/sudoers.old”)
The actionscript will look like:
// download sudoers file from a server somewhere… look up the BigFix “prefetch” command to allow you to download the file AND verify the sha1 to make sure it wasn’t changed en route
download http://someserver.com/somedir/sudoers
// I am not very good with Linux permissions, so you might want to modify these to work appropriately (I am just guessing)
waithidden chown root:root /etc/sudoers
waithidden chmod 440 /etc/sudoers