Linux Shell array length calculation, modification, cyclic output, and other operations

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

In shell, there are two ways to assign values to array variables:

(1) name = (value1... valuen) The subscript starts from 0.

(2) name [Index] = Value

Example:

1. #! /Bin/sh
2. # Arraytest
3. Name = (yunix yhx YFJ)
4. Echo "array is :$ {name [@]}"
5. Echo "array length is :$ {# name [*]}"
6. Echo $ {name [1]}
7. Name [1] = Yang
8. Echo $ {name [1]}
9. Read-a name
10. Echo $ {name [1]}
11. Echo "loop the array"
12. Len = $ {# name [*]}
13. I = 0
14. While [$ I-lt $ Len]
15. Do
16. Echo $ {name [$ I]}
17. Let I ++
18. 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

 

The following is an array output example.

Example:

#! /Bin/sh

2. # Arrayloopout
4. Read-A Array
6. Len =$ {# array [*]}
8. Echo "array's length is $ len"
10. Echo "use while out the array :"
12. I = 0
14. While [$ I-lt $ Len]
16. Do
18. Echo-n "$ {array [$ I]}"
20. Let I ++
22. Done
24. Echo
26. Echo "use for out the array :"
28. For (j = 0; j <"$ len"; j = J + 1 ))
30. Do
32. Echo-N $ {array [$ J]}
34. Done
36. Echo
38. Echo "use for in out the array :"
40. For value in $ {array [*]}
42. Do
44. Echo-N $ Value
46. 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