I edit /etc/hosts as a first line of defense to stop me going to certain distracting sites during the working day.
Ideally I'd like to have two versions of hosts and a cron job that switches them at 9am and 5pm during the day, but I think that there is a permissions issue running cron under sudo... should I just reduce the permissions on hosts?
Answer
You shouldn't need to change permissions of any system file.
I don't see any issue just doing everything under root, i.e. by opening a root shell, and editing the crontab.
sudo -i
crontab -e
You can also directly edit root's crontab with:
sudo crontab -u root -e
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