You can go through all the objects in your .kibana index and see which ones have the type dashboard. There's no specific command to list all of them.
If I had to do it I would do it like this:
create a .kibana* index pattern.
filter only the dashboards from it.
add the uid field to the table in discover, i tihnk it's called _id or something like that in 6.x.
generate a CSV report on it so i can have it exported in an easy to parse format.
but this is for the case where you have way too many dashboards to do manually.
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