Bash 5 reference · Text and System Tools

tr (Linux command)

Translate, squeeze or delete characters, such as changing case, removing carriage returns or splitting words onto lines.

Bash 5

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Syntax

tr [-d] [-s] SET1 [SET2]

Parameter	Description
`'a-z' 'A-Z'`	Map one set to another.
`-d '\r'`	Delete characters.
`-s ' '`	Squeeze repeated characters.

Case and squeeze

echo 'make me loud' | tr a-z A-Z
echo 'too    many   spaces' | tr -s ' '

Output

MAKE ME LOUD
too many spaces

Run this on your computer — see “Get Started” for setup.

Split words and remove CR

echo 'one two three' | tr ' ' '\n'
printf 'line\r\n' | tr -d '\r' | od -c | head -1

Output

one
two
three
0000000   l   i   n   e  \n

Run this on your computer — see “Get Started” for setup.

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Bash sort, uniq, cut and tr · tutorial