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Requires sysfs mounted on /sys - may only be useful for Linux systems.
Could also use "printf '%-8s %s\n' $(basename $f) $(cat $f/address)" instead of echo.
No need for the ls -r and a sort is also not really needed.
The output of ifconfig is localized, using it will fail in non-English environment. "ip" command in iproute2 provides a consistent output and thus is more robust
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