Github user bbende commented on the issue:
https://github.com/apache/nifi/pull/2477
Fixed the issue with returning the appropriate exit code in standalone
mode. An example of testing this would be running a script like the following:
```
#!/bin/sh
CMD_OUT=`./bin/cli.sh registry xyz`
STATUS_CODE=$?
if [ $STATUS_CODE -eq 0 ]; then
echo "SUCCESS"
else
echo "FAILURE"
fi
```
This should print FAILURE since xyz is not a valid command, editing the
script to replace xyz with list-buckets should print SUCCESS.
Also added a security section to the README.
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