linux shell 数组的长度计算、修改、循环输出等操作

From ：http://blog.csdn.net/snrqtdhuqf/article/details/7242309 

在shell中，数组变量的赋值有两种方法：

(1) name = (value1 ... valuen)此时下标从0开始

(2) name[index] = value

 example:

#！/bin/sh
#arrayTest
name=(yunix yhx yfj)
echo "array is:${name[@]}"
echo "array length is:${#name[*]}"
echo ${name[1]}
name[1]=yang
echo ${name[1]}
read -a name
echo ${name[1]}
echo "loop the array"
len=${#name[*]}
i=0
while [ $i -lt $len ]
do
echo ${name[$i]}
let i++
done

result:

array is:yunix yhx yfj
array length is:3
yhx
yang
a b c d e
b
loop the array
a
b
c
d
e

 

下面的是关于数组的输出实例

example:

 

#!/bin/sh  

#arrayLoopOut
read -a array
len=${#array[*]}
echo "array's length is $len"
echo "use while out the array:"
i=0
while [ $i -lt $len ]
do
        echo -n "${array[$i]}"
let i++
done
echo
echo "use for out the array:"
for ((j=0;j<"$len";j=j+1))
do
        echo -n ${array[$j]}
done
echo
echo "use for in out the array:"
for value in ${array[*]}
do
echo -n $value
done

result:

a b c d e f g
array's length is 7
use while out the array:
abcdefg
use for out the array:
abcdefg
use for in out the array:
abcdefg