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