Shell script sort a string

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i have a shell script variable etc "string" i want to give this string as value of another variable,abc sorted like string=CDA want to add ADC to a "ordered" variable

$string=CDA
$ordered=ADC
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anubhava On BEST ANSWER

You can do:

> string=CDA
> s=$(grep -o . <<<"$string"|sort|tr -d "\n")
> echo "$s"
ACD