To split a string into an array in Bash shell, you can use the read command and the -a option.
The read command allows you to read a string and split it into fields, and the -a option allows you to specify an array in which to store the fields.
Here is an example of how you can use the read command and the -a option to split a string into an array:
# Define the string
string="one two three four"
# Split the string into an array
read -a array <<< "$string"
# Print the array elements
echo "Array element 1: ${array[0]}"
echo "Array element 2: ${array[1]}"
echo "Array element 3: ${array[2]}"
echo "Array element 4: ${array[3]}"
This will split the string "one two three four" into an array with four elements, and print the array elements. The output will be:
Array element 1: one Array element 2: two Array element 3: three Array element 4: four
You can also use the IFS variable to specify the delimiter used to split the string. For example, to split the string using a comma as the delimiter, you can use the following command:
# Set the IFS variable to a comma IFS=',' # Split the string into an array read -a array <<< "$string"
This will split the string "one,two,three,four" into an array with four elements.
Overall, the read command and the -a option are useful tools for splitting a string into an array in Bash shell. They allow you to easily split a string into fields and store the fields in an array, and customize the delimiter used to split the string.