Shell script from getting started to complex Quad (array)

multiple values can be stored in an array. The Bash Shell supports only one-dimensional arrays (which do not support multidimensional arrays), and the subscript for array elements starts with 0.

The Shell array is represented by parentheses, and the elements are separated by a "space" symbol, with the following syntax:

Array_name= (value1 ... valuen)

Reading an array

# VI test.sh

#!/bin/bash

Array1= (a B c d)

echo "first element: ${array1[0]}"

echo "second element: ${array1[1]}"

echo "third element: ${array1[2]}"

echo "fourth element: ${array1[3]}"

Output:

# sh test.sh

First element: A

Second element: b

A third element: C

Fourth element: D

Gets all the elements in the array:

# VI test.sh

#!/bin/bash

Array1[0]=a

Array1[1]=b

Array1[2]=c

Array1[3]=d

echo "Elements of array: ${array1[*]}"

echo "Elements of array: ${array1[@]}"

Output:

# sh test.sh

Elements of an array: a B c D

Elements of an array: a B c D

Gets the number of elements in the array:

# VI test.sh

#!/bin/bash

Array1[0]=a

Array1[1]=b

Array1[2]=c

Array1[3]=d

echo "Number of elements of array: ${#array1 [*]}"

echo "Number of elements of array: ${#array1 [@]}"

Output:

# sh test.sh

Number of elements in array: 4

Number of elements in array: 4

Shell script from getting started to complex Quad (array)