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Long story short: why isn't this (simplified) sample working?

root:# sudo -C 3 -u regular-user cat /dev/fd/3 3< /var/log/syslog
cat: /dev/fd/3: No Such file or directory

There is a file that contains

Defaults closefrom_override

in my /etc/sudoers.d

I am using bash 4.2.20 and Debian Wheezy

Thank you so much for your help!

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