#!\bin\sh
echo "enter the string"
read string
if [ -z "$string" ]
then
echo "null string"
else
z=`expr "$string" : '.*'`
echo "string length is $z"
fi
if [ $z -ge 6 ]
then
echo "first 3 characters"
z=`expr "$string" : '\(...\).*'`
echo "$z"
echo "last 3 characters"
x=`expr "$string" : '.*\(...\)'`echo "$x"
fi
