Convert uppercase to lowercase

bash

tr '[:upper:]' '[:lower:]' < input.txt

Explanation

Useful for normalization before comparison or counting.

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Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Same sheet · prioritizing tr Translation and Character Operations

Translate characters from lower to upper case.

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Remove all digits from a stream.

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Replace newlines with spaces.

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Squeeze consecutive newline characters.

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Print the first and third fields from a CSV-like file.

Default lexicographic sort.