bash shell 中数组使用举例

一 背景

让我们先来看一个 shell 脚本的执行过程及结果：

[gysl@gysl-DevOps ~]$ sh array.sh N2 N3 N4The elements of this array 2-4 are: N2 N3 N4N1 is in array.  N2 is in array.  N3 is in array.  N4 is in array.  The original array is as follows: N1 N2 N3 N4The length of this array is 4. The array[2] is N3. Append an element at the end of this array. This array: N1 N2 N3 N4 N5Modify an element in an array. This array: N1 N2 N6 N4 N5

二 实现

实现脚本如下：

#!/bin/basharray=('N1' 'N2' 'N3' 'N4')case $1 in   ${array[0]})    echo "${array[0]}"  ;;  ${array[@]:1:3})    echo "The elements of this array 2-4 are: ${array[@]:1:3}"  ;;  *)    echo "ERROR"  ;;esacfor num in ${array[@]} ;do   echo "${num} is in array. "doneecho "The original array is as follows: ${array[@]}"echo "The length of this array is ${#array[*]}. "echo "The array[2] is ${array[2]}. "array[${#array[@]}]=N5echo "Append an element at the end of this array. This array: ${array[@]}"array[2]=N6echo "Modify an element in an array. This array: ${array[*]}"

三 总结

3.1 这个例子实现了数组的各种用法，我们可以通过执行结果进行直观理解。需要注意的是子数组的获取，元素的修改，追加。