See bellow:
$ ./prospero.sh channel list --dir wf
Server /home/thofman/tmp/prospero/wf is subscribed to following channels:
Use the --full parameter for a complete overview.
custom channels:wildfly-core
Use the --full parameter for a complete overview.
prospero org.wildfly.prospero:prospero-wildfly-galleon-pack
Use the --full parameter for a complete overview.
wildflyee org.wildfly.channels:wildfly-ee
Use the --full parameter for a complete overview.
wildfly org.wildfly.channels:wildfly
The message should be displayed only once, e.g. at the end of the output.