sudo configuration help

[Kihara Muriithi]

Hi pals,

I am trying to configure sudo to selectively allow write access of a
specific file without accidentally giving write access to the whole
system or even a directory. Is this possible and what is the safest
way to go about it?

Specifically, I want to allow write access to a file
/etc/exim/smtp-auth. The sudo users currently have a read access to
it, but that doesn't help much. The system don't have acl working and
configuring them, though straight forward would be too disruptive to
do on production server. How have you pals dealt with this issue?

Regards
William
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