[root@yang python]# vi check_ip.sh
#!/usr/bin/sh
CheckIPAddr()
{
echo $1|grep "^[0-9]\{1,3\}\.\([0-9]\{1,3\}\.\)\{2\}[0-9]\{1,3\}$" > /dev/null;
#IP address must be full number
if [ $? -ne 0 ]
then
return 1
fi
ipaddr=$1
a=`echo $ipaddr|awk -F . '{print $1}'` #Separated by ".", take out the value of each column
b=`echo $ipaddr|awk -F . '{print $2}'`
c=`echo $ipaddr|awk -F . '{print $3}'`
d=`echo $ipaddr|awk -F . '{print $4}'`
for num in $a $b $c $d
do
if [ $num -gt 255 ] || [ $num -lt 0 ] #Each value must be between 0-255
then
return 1
fi
done
return 0
}
if [ $# -ne 1 ];then #Judge the number of passed parameters
echo "Usage: $0 ipaddress."
exit
else
CheckIPAddr $1
fi