diff --git a/lib/vagrant-skytap/command/publish_url/create.rb b/lib/vagrant-skytap/command/publish_url/create.rb
index db46152..e640213 100644
--- a/lib/vagrant-skytap/command/publish_url/create.rb
+++ b/lib/vagrant-skytap/command/publish_url/create.rb
@@ -36,6 +36,8 @@ def execute
             opts = OptionParser.new do |o|
               o.banner = "Usage: vagrant publish-url create [options]"
               o.separator ""
+              o.separator "Share an environment via the Skytap Cloud UI."
+              o.separator ""
               o.separator "Options:"
               o.separator ""
 
@@ -44,7 +46,7 @@ def execute
                 options[:password] = p
               end
 
-              o.on("-np", "--no-password", "Do not set a password") do |np|
+              o.on("-n", "--no-password", "Do not set a password") do |n|
                 options[:no_password] = true
               end
 
@@ -62,20 +64,25 @@ def execute
             end
             password ||= ""
 
-            ps = fetch_environment.create_publish_set(
-              name: "Vagrant publish set",
-              publish_set_type: "single_url",
-              vms: target_skytap_vms.collect do |vm|
-                {
-                  vm_ref: vm.url,
-                  access: "run_and_use",
-                }
-              end,
-              password: password
-            )
-            @logger.debug("New publish set: #{ps.url}")
+            environment = fetch_environment
+            if (environment).nil?
+              @env.ui.info(I18n.t("vagrant_skytap.commands.publish_urls.fetch_environment_is_undefined"))
+            else
+              ps = environment.create_publish_set(
+                name: "Vagrant publish set",
+                publish_set_type: "single_url",
+                vms: target_skytap_vms.collect do |vm|
+                  {
+                    vm_ref: vm.url,
+                    access: "run_and_use",
+                  }
+                end,
+                password: password
+              )
+              @logger.debug("New publish set: #{ps.url}")
 
-            @env.ui.info(I18n.t("vagrant_skytap.commands.publish_urls.created", url: ps.desktops_url))
+              @env.ui.info(I18n.t("vagrant_skytap.commands.publish_urls.created", url: ps.desktops_url))
+            end
 
             # Success, exit status 0
             0
diff --git a/lib/vagrant-skytap/command/publish_url/delete.rb b/lib/vagrant-skytap/command/publish_url/delete.rb
index 0d3d322..230fba6 100644
--- a/lib/vagrant-skytap/command/publish_url/delete.rb
+++ b/lib/vagrant-skytap/command/publish_url/delete.rb
@@ -35,8 +35,8 @@ def execute
 
             opts = OptionParser.new do |o|
               o.separator ""
-              o.separator "Deletes all published URLs for this project, including any"
-              o.separator "created through the Skytap UI."
+              o.separator "Delete the sharing portal. Users can no longer access"
+              o.separator "the environment through the URL."
 
               o.banner = "Usage: vagrant publish-url delete [options]"
               o.separator ""
@@ -50,7 +50,10 @@ def execute
 
             return unless argv = parse_options(opts)
 
-            if publish_sets = fetch_environment.publish_sets.presence
+            environment = fetch_environment
+            if (environment).nil?
+              @env.ui.info(I18n.t("vagrant_skytap.commands.publish_urls.fetch_environment_is_undefined"))
+            elsif publish_sets = environment.publish_sets.presence
               unless options[:force]
                 confirm = @env.ui.ask(I18n.t("vagrant_skytap.commands.publish_urls.confirm_delete"))
                 return unless confirm.downcase == 'y'
diff --git a/lib/vagrant-skytap/command/publish_url/root.rb b/lib/vagrant-skytap/command/publish_url/root.rb
index ac5242e..1a12b94 100644
--- a/lib/vagrant-skytap/command/publish_url/root.rb
+++ b/lib/vagrant-skytap/command/publish_url/root.rb
@@ -74,6 +74,8 @@ def help
             opts = OptionParser.new do |opts|
               opts.banner = "Usage: vagrant publish-url <subcommand> [<args>]"
               opts.separator ""
+              opts.separator "Manages Skytap sharing portals."
+              opts.separator ""
               opts.separator "Available subcommands:"
 
               # Add the available subcommands as separators in order to print them
diff --git a/lib/vagrant-skytap/command/publish_url/show.rb b/lib/vagrant-skytap/command/publish_url/show.rb
index 9f2111b..56ea0d9 100644
--- a/lib/vagrant-skytap/command/publish_url/show.rb
+++ b/lib/vagrant-skytap/command/publish_url/show.rb
@@ -20,6 +20,7 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 # DEALINGS IN THE SOFTWARE.
 
+require 'optparse'
 require 'vagrant-skytap/command/helpers'
 
 module VagrantPlugins
@@ -30,7 +31,22 @@ class Show < Vagrant.plugin("2", :command)
           include Command::Helpers
 
           def execute
-            if publish_sets = fetch_environment.publish_sets.presence
+            options = {}
+            opts = OptionParser.new do |o|
+              o.banner = "Usage: vagrant publish-url show [<args>]"
+              o.separator ""
+              o.separator "Show the sharing portal, the VMs included, and whether"
+              o.separator "the URL is password-protected."
+              o.separator ""
+              o.separator "Available subcommands:"
+            end
+
+            return unless argv = parse_options(opts)
+
+            environment = fetch_environment
+            if (environment).nil?
+              @env.ui.info(I18n.t("vagrant_skytap.commands.publish_urls.fetch_environment_is_undefined"))
+            elsif publish_sets = environment.publish_sets.presence
               results = publish_sets.collect do |ps|
                 "#{ps.desktops_url || 'n/a'}\n" \
                   "  VMs: #{machine_names(ps.vm_ids).join(', ').presence || '(none)'}" \
diff --git a/locales/en.yml b/locales/en.yml
index d43cb3a..3f1f698 100644
--- a/locales/en.yml
+++ b/locales/en.yml
@@ -227,6 +227,8 @@ en:
           created through the Skytap UI) have been deleted. Users cannot
           manage these VMs, or access them through SmartClient, unless they
           have a Skytap user account with appropriate permissions.
+        fetch_environment_is_undefined: |-
+          The command failed because the environment does not exist. Run `vagrant up` to create the environment.
       halt:
         not_allowed_if_suspended: |-
           Suspended machines cannot be halted gracefully. Run `vagrant up`