shell 获取数组的长度

code

macname@localhost Desktop % cat test.sh
my_array[0]=A
my_array[1]=B
my_array[2]=C
my_array[3]=D

echo "数组元素个数为: ${#my_array[*]}"
echo "数组元素个数为: ${#my_array[@]}"%                                                                                
macname@localhost Desktop % 
macname@localhost Desktop % ./test.sh  
数组元素个数为: 4
数组元素个数为: 4