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#! /bin/bash
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checkip() {
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if echo $1 |egrep -q '^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$' ; then
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a=`echo $1 | awk -F. '{print $1}'`
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b=`echo $1 | awk -F. '{print $2}'`
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c=`echo $1 | awk -F. '{print $3}'`
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d=`echo $1 | awk -F. '{print $4}'`
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for n in $a $b $c $d; do
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if [ $n -ge 255 ] || [ $n -le 0 ]; then
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echo 'bad ip(2)!'
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return 2
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fi
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done
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else
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echo 'bad ip(1)!'
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return 1
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fi
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}
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echo -n "Please input the ip:"
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read ip
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checkip $ip
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