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In Arch Linux, how can I check if a network device (say eth0) has a carrier signal present?

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Possible duplicate? Some more methods there. – sr_ Nov 10 '11 at 13:04
up vote 9 down vote accepted

cat /sys/class/net/eth0/carrier is by far the easiest method.

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If you want that information and more in handy little commands:

mii-tool eth0
ethtool eth0

might do the job.

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