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Tr

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Man page:tr

Translate or delete characters.

Usage ​

shell
tr OPTIONS SET1 SET2
OptionDescription
-d --deleteDelete characters instead of translating.

Example ​

Replace ? with !:

shell
echo 'Hello world!?' | tr '?' '!' # => 'Hello world!!'

Remove - or : from date/time, useful if going to compare:

shell
echo '2025-03-25' | tr -d '-' # => 20250325
echo '17:57:53' | tr -d ':' # => 175753