linux 獲取網絡卡狀態

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#!/bin/sh

BASEDIR="/sys/class/net"
for i in $( ls $BASEDIR ) 
do 
    if [ -L $BASEDIR/$i ]; then
        carrier=`cat $BASEDIR/$i/carrier 2>/dev/null || echo 0`
        operstate=`cat $BASEDIR/$i/operstate 2>/dev/null || echo 0`
        echo $i:$carrier:$operstate
    fi
done