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How to convert a string to lowercase in Bash

Gutha Vamsi Krishna

Overview

In this shot, we'll learn how to convert a string to lowercase in Bash. We'll use the tr command to achieve this. The command tr stands for translate.

Syntax

echo "Provide your string here" | tr '[:upper:]' '[:lower:]'

Parameters

The tr command accepts two sets of characters. We provide the first set as [:upper:] and the second set as [:lower:] so tr will replace the uppercase characters with lowercase characters. Let's take a look at an example.

Example

echo "HELLO FROM EDUCATIVE !!!" | tr '[:upper:]' '[:lower:]'

Explanation

In the code snippet above, we convert the uppercase string HELLO FROM EDUCATIVE !!! to lowercase hello from educative !!! using the tr command.

echo "HELLO FROM EDUCATIVE !!!" | tr 'A-Z' 'a-z'

Explanation

We can also pass A-Z as the first set and a-z as the second test to convert a string to lowercase.

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