Command injection vulnerability

FYI - this is likely opening the door for command injection

https://github.com/NSO-developer/nso-sso-duo-integration---native/blob/cli_auth/my-test-auth.sh#L15C1-L15C73

```sh
	/bin/bash -c "nohup /usr/sbin/login_duo  -d -f $user &> /tmp/$user.txt"
```


IE: What happens if an attacker uses a malicious username? IE: 

```
>/dev/null; echo "whatever is needed";
```