m_array=(1 2 3 4)

m_array[0]=0
m_array[1]=1
m_array[2]=2

echo "数组元素个数为: ${#m_array[*]}"
echo "数组元素个数为: ${#m_array[@]}"

echo ${m_array[0]}
echo ${m_array[1]}

sum=0;
for value in ${m_array[*]};
do 
    sum=`expr $sum + $value`;
    echo $sum; 
done

sum=0;
len=${#m_array[*]}
for (( index = 0; index < ${len}; index++ ));
do 
    sum=`expr ${sum} + ${m_array[index]}`;
    echo $sum; 
done

[user@manjaro ~]$ ./test.sh a b c
$1 $2 $3,依次为第一个参数，第二个参数，第三个参数
$@ 参数列表

echo "长度: $#"

echo "参数 1: $1"
echo "参数 2: $2"
echo "参数 3: $3"

echo "参数列表：$@"

echo "所有参数按照字符串显示: $*"