一 背景
讓我們先來看一個 shell 腳本的執行過程及結果：
[gysl@gysl-DevOps ~]$ sh array.sh N2 N3 N4
The elements of this array 2-4 are: N2 N3 N4
N1 is in array.
N2 is in array.
N3 is in array.
N4 is in array.
The original array is as follows: N1 N2 N3 N4
The 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 N5
Modify an element in an array. This array: N1 N2 N6 N4 N5
二 實現
實現腳本如下：
#!/bin/bash
array=('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"
;;
esac
for num in ${array[@]} ;do
echo "${num} is in array. "
done
echo "The original array is as follows: ${array[@]}"
echo "The length of this array is ${#array[*]}. "
echo "The array[2] is ${array[2]}. "
array[${#array[@]}]=N5
echo "Append an element at the end of this array. This array: ${array[@]}"
array[2]=N6
echo "Modify an element in an array. This array: ${array[*]}"
三 總結
3.1 這個例子實現了數組的各種用法，我們可以通過執行結果進行直觀理解。需要注意的是子數組的獲取，元素的修改，追加。
3.2 shell 數組的使用與其他編程語言有所不同，可以類比理解。
分享到:
閱讀更多 耕耘實錄 的文章
