linux shell 之数组操作

Regular arrays are arrays which can use onlyintegers as its array index. But associativearrays are arrays which can take a string as its array index.

 

array_var=(1 2 3 4 5 6)
#Values will be stored in consecutive locations starting from index 0.

lternately, define an array as a set of index-value pairs as follows:
array_var[0]="test1"
array_var[1]="test2"
array_var[2]="test3"
array_var[3]="test4"
array_var[4]="test5"
array_var[5]="test6"

Print all of the values in an array as a list using:

$ echo${array_var[*]}

test1 test2 test3test4 test5 test6

Alternately, you canuse:

$ echo${array_var[@]}

 

Print the length of an array (the number of elementsin an array), as follows:

$ echo${#array_var[*]}

6

 

Defining associative arrays

$ declare -Aass_array

$ass_array=([index1]=val1 [index2]=val2)

$ass_array[index1]=val1

$ass_array[index2]=val2

 

Listing of array indexes

$ echo${!array_var[*]}

Or, we can also use:

$ echo${!array_var[@]}