Shell Script---Array

Array definition: The so-called array, is the same data type of elements in a certain order of the set, that is, the finite type of the same variable with a name command, that is, these variables are defined as a group, they do not have their own name, then how do we find the variables or elements? is by index or subscript (sometimes called subscript variable)

Array Features:

1. Arrays are collections of elements of the same data type

2, the elements in the array are sequential, they put together in memory in this order, that is to say: The array is a contiguous memory of a space.

3. The array element is represented by the entire array name and its own sequential position in the array, a[0] means: The first element in array A (or the first component) and so on, the array Subscript (index) in the bash shell starts at 0.

Example: Now there are AA, BB, CC, DD, EE, ff Six elements to create these files under/tmp in their name, using the For Loop way. How do you write it?

Let's start by talking about the array assignment method:

The first method:

array= (aa bb cc dd EE ff separate each element with a space.

Second method: Using key-value pairs (key=value)

array= ([0]=AA [1]=BB] [2]=CC [3]=DD] [4]=ee [5]=FF]

The third method: You can use DECLARE-A to declare a variable type as an array type and assign it later.

Declare-a ARRAY

Array[0]=aa

Array[1]=bb

Array[2]=cc

Array[3]=dd

Array[4]=ee

Array[5]=ff

This method assigns a value to the array, but there is a flaw, which is a bit silly when the array component (element) is relatively large.

The fourth method: Use the result of the system execution command as an array element.

That is: array= ($ (LS)) this way

Declare-a array #先声明一个变量, array type

values= "AA bb cc dd EE ff" #将数组中的各个元素保存在一个变量中用空格作为分隔符

Array= ($ (Echo ${values}))

To write this script: The following text-mode ....

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#!/bin/bash

#Author: Wangergui email:[email protected] date:2016-08-26

#Release 1.0

#Function: Auto Create files (practice array)

Path=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:~/bin

Export PATH

files= "AA bb cc dd EE ff"

Declare-a ARRAY

Array= ($ (Echo ${files}))

index=$ ((${#ARRAY [@]}-1))

function Check () {

if [!-F "$"];then

return 0

Else

Return 1

Fi

}

For I in $ (seq 0 ${index});d O

Check/tmp/${array[${i}]}

If [$?-eq 0];then

Touch/tmp/${array[${i}]}

Fi

This article from the "Linux-related technology" blog, declined to reprint!

Shell Script---Array