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Let’s talk about removing elements from a Bash array. There are two common removal scenarios:
  • Remove a specific element from an array.
  • Remove all elements (clear the entire array).
Both are done with the unset builtin. Use unset array[index] to remove a single element or unset array to remove the entire array variable.

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Remove a specific element

To delete the element at index 1 (the second element):
Example: remove the element at index 1 and print the remaining elements.
Example output:
How Bash handles this:
  • unset servers[1] removes the element with index 1. Bash does not renumber (reindex) the remaining elements; the array may become sparse.
  • When you expand an array with "${servers[@]}", Bash prints the values of existing indices in ascending order, which can make it look like elements were shifted.
Removing an element with unset deletes that specific index; Bash preserves the original index numbers of remaining elements. Expanding "${servers[@]}" prints the present values in index order, so gaps are not visible in the flat expansion.

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Demonstrating index access after unset

After removing the element at index 1, accessing that index yields an empty string, while other indices retain their values:
Example output:

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Remove the entire array

To delete the entire array variable and all its elements:
Example:
Example output:

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Quick reference

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Summary

  • Use unset array[index] to remove a single element. Remaining indices are preserved (no automatic reindexing).
  • Use unset array to remove the entire array variable.
  • Inspect individual indices (e.g., ${array[1]}) to detect unset slots.
  • Expanding with "${array[@]}" prints all existing values in index order and hides any gaps.
References:
A slide titled "Arrays remove" on a dark background, featuring a yellow lightbulb icon and a checked box. The box contains the text: "Inserting and removing data are the basic operations we can do to an array."

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