Shell Array Definition and acquisition

Shell Array

Bash supports one-dimensional arrays (which do not support multidimensional arrays) and does not limit the size of arrays.

Similar to the C language, the subscript of an array element is numbered starting with 0. Gets the elements in the array to take advantage of subscript, the subscript can be an integer or an arithmetic expression whose value should be greater than or equal to 0.

Defining arrays

In the Shell, the array is represented by parentheses, and the elements of the array are separated by a "space" symbol. The general form of the definition array is:

数组名=(值1 值2 ... 值n)

For example:

array_name=(value0 value1 value2 value3)

Reading an array

The general format for reading array element values is:

${数组名[下标]}

For example:

valuen=${array_name[n]}

Gets the length of the array

The method of getting the length of the array is the same as getting the string length, for example:

# 取得数组元素的个数length=${#array_name[@]}# 或者length=${#array_name[*]}# 取得数组单个元素的长度lengthn=${#array_name[n]}

Shell Array Definition and acquisition