tr Command - Translate or Delete Characters

The tr command is used to translate, squeeze, or delete characters from standard input and write the result to standard output. It is commonly used for text processing in pipelines.

Syntax

tr [options] SET1 [SET2]

Examples

echo "hello world" | tr 'a-z' 'A-Z'

echo "hello  world" | tr -s ' '

echo "hello,world" | tr -d ','

Notes

• Works only with single-byte characters (not multibyte/Unicode).
• Commonly used in shell pipelines for simple text transformations.
• For field extraction, see cut.