在Linux shell中，如何将一个字符串转化为数组？
方法一：
myvar="string1 string2 string3"
read -a myarray <<< $myvar
echo "My array: ${myarray[@]}"
echo "My array: ${myarray[0]}"
echo "My array: ${myarray[1]}"
echo "My array: ${myarray[2]}"
echo "Number of elements in the array: ${#myarray[@]}"方法二：
myvar="string1 string2 string3"
myarray=($myvar)
echo "My array: ${myarray[@]}"
echo "My array: ${myarray[0]}"
echo "My array: ${myarray[1]}"
echo "My array: ${myarray[2]}"
echo "Number of elements in the array: ${#myarray[@]}"方法三：
myvar="string1,string2,string3"
IFS="," read -a myarray <<< $myvar
echo "My array: ${myarray[@]}"
echo "My array: ${myarray[0]}"
echo "My array: ${myarray[1]}"
echo "My array: ${myarray[2]}"
echo "Number of elements in the array: ${#myarray[@]}"运行结果均为：
