Get Tfs Shelveset file contents at the command prompt?

tf status /shelveset:name

will list out the content of the named shelveset (you can also supplier an owner: see tf help status).

With the TFS PowerToy's PowerShell snapin:

Get-TfsPendingChange -Shelveset name

for the same information.

It is possible to construct a small command-line application that uses the TFS SDK, which returns the list of files contained in a given shelveset.
The sample below assumes knowledge of the Shelveset name & it's owner:

using System;
using System.IO;
using System.Collections.ObjectModel;
using Microsoft.TeamFoundation.Client;
using Microsoft.TeamFoundation.Framework.Common;
using Microsoft.TeamFoundation.Framework.Client;
using Microsoft.TeamFoundation.VersionControl.Client;

namespace ShelvesetDetails
{
    class Program
    {
        static void Main(string[] args)
        {
            Uri tfsUri = (args.Length < 1) ? new Uri("TFS_URI") : new Uri(args[0]);

            TfsConfigurationServer configurationServer = TfsConfigurationServerFactory.GetConfigurationServer(tfsUri);

            ReadOnlyCollection<CatalogNode> collectionNodes = configurationServer.CatalogNode.QueryChildren(
                new[] { CatalogResourceTypes.ProjectCollection },
                false, CatalogQueryOptions.None);

            CatalogNode collectionNode = collectionNodes[0];

            Guid collectionId = new Guid(collectionNode.Resource.Properties["InstanceId"]);
            TfsTeamProjectCollection teamProjectCollection = configurationServer.GetTeamProjectCollection(collectionId);

            var vcServer = teamProjectCollection.GetService<VersionControlServer>();

            Shelveset[] shelves = vcServer.QueryShelvesets(
                "SHELVESET_NAME", "SHELVESET_OWNER");
            Shelveset shelveset = shelves[0];

            PendingSet[] sets = vcServer.QueryShelvedChanges(shelveset);
            foreach (PendingSet set in sets)
            {
                PendingChange[] changes = set.PendingChanges;
                foreach (PendingChange change in changes)
                {
                    Console.WriteLine(change.FileName);
                }
            }
        }
    }
}

Invoking this console app & catching the outcome during execution of the powershell should be possible.

Try:

tfpt review /shelveset:shelvesetName;userName

You may also need to add on the server option so something like:

tfpt review /shelveset:Code Review;jim /sever:company-source

I think this is what you are looking for.