The list_vhosts option can be used to return the list of virtual hosts which should produce something like this.

~]$ rabbitmqctl list_vhosts
Listing vhosts ...
name
/
foo
bar

There are only two additional arguments that can be included, name and tracing. The tracing option will return either true or false.

~]$ rabbitmqctl list_vhosts name tracing
Listing vhosts ...
name    tracing
/       false
foo     false
bar     false

The --quiet option can be used to suppress "Listing vhosts ..." from the output.

~]$ rabbitmqctl list_vhosts name tracing --quiet
name    tracing
/       false
foo     false
bar     false

The --formatter json option can be used to return the output in JSON.

~]$ rabbitmqctl list_vhosts name tracing --quiet --formatter json
[
{"name":"/","tracing":false}
,{"name":"foo","tracing":false}
,{"name":"bar","tracing":false}
]