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I'm trying to wrap my head around the thinking behind doing say

echo "nameserver 10.42.0.1" | sudo tee -a /etc/resolv.conf

rather than

echo "nameserver 10.42.0.1" >> /etc/resolv.conf

as root (e.g., after su or sudo bash). Is it a minimize time as root thing or is there something else to it?

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    this is not RPi related ... it is a linux question
    – jsotola
    Apr 10, 2018 at 4:41
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    Is it really a Linux idiom as opposed to a Pi Linux idiom? The place where (I think) I've encountered it the most is the context of the Pi – but most of my commuting life is spent of BSD systems. My interest it the question is around writing for a Pi audience, personally I'd do it with vi.
    – dlu
    Apr 10, 2018 at 5:09

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It's a common Linux idiom. The idea behind it is to run only the tee process as root instead of a shell. Since tee is very simple, it's much less likely to have bugs or respond to unexpected user input in a dangerous way, compared to e.g. bash.

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