How to remove the last element from an array in Bash

In this tutorial, we are going to learn about how to remove the last element from an array in Bash shell.

Consider, we have the following array:

arr=(a b c d)

To remove the last element (b) from an above array, we can use the built-in unset command followed by the arr[-1] in bash.

Here is a working example:

arr=(a b c d)

unset arr[-1] # removes the last element

echo ${arr[@]} # prints the array

Output:

a b c

Similarly, you can also use the following syntax.

unset arr[${#arr[@]}-1]