uppercase first character in a variable with bash

Question

I want to uppercase just the first character in my string with bash.

foo=\"bar\";

//uppercase first character

echo $foo;

should print \"B

Answer 1

To capitalize first word only:

foo='one two three'
foo="${foo^}"
echo $foo

One two three

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To capitalize every word in the variable:

foo="one two three"
foo=( $foo ) # without quotes
foo="${foo[@]^}"
echo $foo

One Two Three

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(works in bash 4+)