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[Help-bash] eth0 up or down?

From: Mike McClain
Subject: [Help-bash] eth0 up or down?
Date: Sat, 22 Apr 2017 22:08:49 -0700
User-agent: Mutt/1.5.21 (2010-09-15)

    How can I tell from bash whether eth0 is up or down that would be
faster or less expensive than $(ifconfig eth0;)? Is there some where
in /proc or elsewhere in memory a bash program can reach?
    Thanks for your thoughts,
A wise man will make more opportunities than he finds.
    - Francis Bacon

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