I am trying to only change the first letter of a string to lowercase using a Shell script. Ideally a simple way to go from CamelCase to lowerCamelCase.

GOAL:

```
$DIR="SomeString"
# missing step
$echo $DIR
someString

```

I have found some [great resources for doing this to the entire string](https://stackoverflow.com/questions/2264428/converting-string-to-lower-case-in-bash-shell-scripting) but not just altering the first letter and leaving the remaining string untouched.