Linux plain arrays and associative arrays

Arrays: You use an index to store multiple data as a collection.

Normal array: The index of an array can only use integers

Associative arrays: Array indexes can use integers and strings (associative arrays are supported for versions above bash4.0)

Arrays are often used in interactions with loops or other judgments to make a higher sense.

Definition of an ordinary array

Array1= (a AB 3a)

The index of the array from 0 to the starting index

echo ${array1[0]} output: A

echo ${array1[2]} output: 12

Arrays can also be defined as

arry[0]= "Test0"

arry[1]= "Test1"

arry[2]= "Test2"

Print the values in the array at once

echo ${arry[*]} or echo ${arry[@]}

Output: Test0 test1 test2

Print all indexes of an array

Echo ${!arry[*]}

Output: 0 1 2

Print the total number of array values

echo ${#arry [*]}

Output: 3

Associative array definitions

First, declare that this array3 is an associative array

Declare-a arr

Associative array Assignment

index = value

Arr= ([App]=a [n-11]=b [110]=c]

can also

Array3[aa]=var1

Array3[a10]=var2

Print the values in the array at once

Echo ${array3[*]}

Print all indexes of an array

Echo ${!array3[*]}

This article is from the "Tiandaochouqin" blog, make sure to keep this source http://xiang99.blog.51cto.com/3583449/1413762