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:]'