diff --git a/Viewer/features/cli.js b/Viewer/features/cli.js
index f1510bed..148f4212 100755
--- a/Viewer/features/cli.js
+++ b/Viewer/features/cli.js
@@ -26,7 +26,9 @@ if(typeof(process) != 'undefined'){
 	var pathlib = requirejs('path')
 	var argv = requirejs('lib/argv')
 	var progress = requirejs('cli-progress')
-	var colors = requirejs('colors') }
+	var colors = requirejs('colors') 
+
+	var file = require('imagegrid/file') }
 
 
 
@@ -53,14 +55,6 @@ var CLIActions = actions.Actions({
 				return this.getActionAttr(action, 'cli') }.bind(this)) },
 
 
-	// XXX need introspection...
-	// 		...some thing like .ls(path) to printout:
-	// 			- metadata (image count, dates, ...)
-	// 			- collections
-	// 			- ...
-	// XXX
-
-
 	// XXX should this be here???
 	// 		...move this to progress...
 	// XXX we are missing some beats, is this because we do not let the 
@@ -265,7 +259,86 @@ var CLIActions = actions.Actions({
 							pathlib.dirname(nodeRequire.main.filename), 
 							'e.js') ],
 						{ detached: true, }) } }],
-	/*/ XXX
+
+	// Introspection...
+	//
+	/* XXX 
+	cliInfo: ['- System/Show information about index in PATH',
+		{cli: {
+			name: '@info', 
+			arg: 'PATH',
+			default: '.',
+		}},
+		function(path, options={}){
+			// XXX
+		}],
+	//*/
+	// XXX revise naming...
+	// XXX how do we handle errors???
+	cliListCollections: ['- System/List collections in index',
+		{cli: argv && argv.Parser({
+			key: '@collections',
+			doc: 'List collection in index at PATH',
+			arg: 'PATH',
+
+			'-version': undefined,
+			'-quiet': undefined,
+
+			'-f': '-full',
+			'-full': {
+				doc: 'show full collection information',
+				type: 'bool',
+			},
+		})},
+		function(path, options={}){
+			var that = this
+
+			this.setupFeatures()
+
+			path = path || options.value
+			path = util.normalizePath(
+				path ?
+					pathlib.resolve(process.cwd(), path)
+					: process.cwd())
+			return this.loadIndex(path)
+				.then(
+					function(){
+						for(var name of that.collection_order || []){
+							// XXX revise output formatting...
+							options.full ?
+					   			console.log(that.collections[name].gid, name) 
+								: console.log(name) } },
+					function(err){
+						// XXX how do we handle rejection???
+						console.error('Can\'t find or load index at:', path) }) }],
+	// XXX handle errors...
+	cliListIndexes: ['- System/List indexes in PATH',
+		{cli: argv && argv.Parser({
+			key: '@ls', 
+			arg: 'PATH',
+			default: '.',
+
+			'-version': undefined,
+			'-quiet': undefined,
+
+			'-r': '-recursive',
+			'-recursive': {
+				doc: 'List nested/recursive indexes',
+				type: 'bool',
+			},
+		})},
+		function(path, options={}){
+			file.listIndexes(path)
+				.on('end', function(paths){
+					paths = 
+						(options.recursive ? 
+							paths
+							: file.skipNested(paths))
+						.sortAs(paths)
+					for(var p of paths){
+						console.log(p.replace(/.ImageGrid$/, '')) } }) }],
+
+	/* XXX
 	startWorker: ['- System/Start as worker',
 		{cli: '-worker'},
 		function(){
@@ -424,41 +497,6 @@ var CLIActions = actions.Actions({
 						// XXX how do we handle rejection???
 						console.error('Can\'t find or load index at:', path) }) }],
 
-	// XXX revise naming...
-	// XXX how do we handle errors???
-	cliListCollections: ['- System/List collections in index',
-		{cli: argv && argv.Parser({
-			key: '@collections',
-			arg: 'PATH',
-
-			'-f': '-full',
-			'-full': {
-				doc: 'show full collection information',
-				type: 'bool',
-			},
-		})},
-		function(path, options={}){
-			var that = this
-
-			this.setupFeatures()
-
-			path = path || options.value
-			path = util.normalizePath(
-				path ?
-					pathlib.resolve(process.cwd(), path)
-					: process.cwd())
-			return this.loadIndex(path)
-				.then(
-					function(){
-						for(var name of that.collection_order || []){
-							// XXX revise output formatting...
-							options.full ?
-					   			console.log(that.collections[name].gid, name) 
-								: console.log(name) } },
-					function(err){
-						// XXX how do we handle rejection???
-						console.error('Can\'t find or load index at:', path) }) }],
-
 	// Utility... (EXPERIMENTAL)
 	//
 	// XXX metadata caching and preview creation are not in sync, can 
diff --git a/Viewer/imagegrid/file.js b/Viewer/imagegrid/file.js
index 0d384e89..c192c2e4 100755
--- a/Viewer/imagegrid/file.js
+++ b/Viewer/imagegrid/file.js
@@ -40,7 +40,9 @@ var INDEX_DIR = '.ImageGrid'
 
 // Skip nested indexes from tree...
 //
-var skipNested = function(paths, index_dir, logger){
+var skipNested = 
+module.skipNested =
+function(paths, index_dir, logger){
 	logger = logger && logger.push('Skipping nested')
 
 	paths = paths