/opt/nifi-registry/nifi-toolkit-registry-2.12.0/bin/persistence-toolkit.sh

persistence-toolkit.sh: JAVA_HOME not set; results may vary
/opt/nifi-registry/nifi-toolkit-registry-2.12.0/classpath:/opt/nifi-registry/nifi-toolkit-registry-2.12.0/lib/*
14:31:01.850 [main] ERROR org.apache.nifi.registry.toolkit.persistence.FlowPersistenceProviderMigrator -- Unable to parse command line.
org.apache.commons.cli.UnrecognizedOptionException: Unrecognized option: --help
	at org.apache.commons.cli.DefaultParser.handleUnknownToken(DefaultParser.java:644)
	at org.apache.commons.cli.DefaultParser.handleLongOptionWithoutEqual(DefaultParser.java:478)
	at org.apache.commons.cli.DefaultParser.handleLongOption(DefaultParser.java:430)
	at org.apache.commons.cli.DefaultParser.handleToken(DefaultParser.java:621)
	at org.apache.commons.cli.DefaultParser.parse(DefaultParser.java:764)
	at org.apache.commons.cli.DefaultParser.parse(DefaultParser.java:816)
	at org.apache.commons.cli.DefaultParser.parse(DefaultParser.java:798)
	at org.apache.commons.cli.DefaultParser.parse(DefaultParser.java:777)
	at org.apache.nifi.registry.toolkit.persistence.FlowPersistenceProviderMigrator.main(FlowPersistenceProviderMigrator.java:77)
 usage:  persistence-toolkit [args]

    Options                 Description
 -t, --to <arg>     Providers xml to migrate to.