How to Convert a String to Lower Case in Bash

Robert Thorne
Robert Thorne
• • 20 min read

Is There a Way in Bash to Convert a String into a Lower Case String? for Example, If I Have: A="Hi All" I Want to Convert It to: "Hi All" 1 26 Answers the Are...

How to Convert a String to Lower Case in Bash

Is there a way in to convert a string into a lower case string?

For example, if I have:

a="Hi all"

I want to convert it to:

"hi all"
1

26 Answers

The are various ways:

Must Read

POSIX standard

tr

$ echo "$a" | tr '[:upper:]' '[:lower:]'
hi all

AWK

$ echo "$a" | awk '{print tolower($0)}'
hi all
Robert Thorne

Robert Thorne

Automotive & Future Transportation Editor
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Robert Thorne covers electric vehicle innovations, autonomous driving systems, global mobility trends, and automotive engineering developments.