Tr

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Internal

Overview

Translate characters.

Options

-d

Delete from the input the characters specified in the given string.

Example, delete new lines:

cat ./test.txt | tr -d \\n

To Uppercase

Also see bash Parameter and Variable Expansion.

First Character

$(echo ${var_name:0:1} | tr '[:lower:]' '[:upper:]')${var_name:1}

All Characters

echo "hi" | tr '[:lower:]' '[:upper:]'