diff --git a/src/core/filesystem.cpp b/src/core/filesystem.cpp
index 611520c..5339aaf 100644
--- a/src/core/filesystem.cpp
+++ b/src/core/filesystem.cpp
@@ -4,10 +4,52 @@
 #include <LittleFS.h>
 #include "log.h"
 
-void filesystemMount() {
+void fsMount() {
   if (LittleFS.begin()) {
-    info("filesystem mounted: %3d%% used", (int) round(100.0 * (LittleFS.usedBytes()) / LittleFS.totalBytes()));
+    info("filesystem mounted: %3d%% used (%d bytes)", static_cast<int>(round(100.0 * LittleFS.usedBytes() / LittleFS.totalBytes())), LittleFS.usedBytes());
+    fsList(LittleFS, "/");
   } else {
     error("failed to mount filesystem");
   }
 }
+
+void fsList(fs::FS& fs, const char *path, const String& indent) {
+  auto dir = fs.open(path);
+  if (!dir) {
+    error("not found: %s", path);
+    return;
+  }
+  if (!dir.isDirectory()) {
+    error("not a directory: %s", path);
+    return;
+  }
+
+  info("LS: %s %4s %s", indent, "", dir.name());
+
+  const auto indent2 = indent + "  ";
+
+  while (true) {
+    auto file = dir.openNextFile();
+    if (!file) {
+      break;
+    }
+    if (file.isDirectory()) {
+      fsList(fs, file.path());
+    }
+    file.close();
+  }
+
+  dir.rewindDirectory();
+  while (true) {
+    auto file = dir.openNextFile();
+    if (!file) {
+      break;
+    }
+    if (!file.isDirectory()) {
+      info("LS: %s %4d %s", indent2, file.size(), file.name());
+    }
+    file.close();
+  }
+
+  dir.close();
+}
diff --git a/src/core/filesystem.h b/src/core/filesystem.h
index dc08a30..a4dec85 100644
--- a/src/core/filesystem.h
+++ b/src/core/filesystem.h
@@ -1,6 +1,11 @@
 #ifndef FILESYSTEM_H
 #define FILESYSTEM_H
 
-void filesystemMount() ;
+#include <FS.h>
+#include <WString.h>
+
+void fsMount();
+
+void fsList(fs::FS& fs, const char *path, const String& indent = "");
 
 #endif
diff --git a/src/core/log.cpp b/src/core/log.cpp
index edd04e0..92236e3 100644
--- a/src/core/log.cpp
+++ b/src/core/log.cpp
@@ -6,6 +6,7 @@
 #include <LittleFS.h>
 
 #include "clock.h"
+#include "filesystem.h"
 
 void doLog(LogLevel level, const char *format, va_list args);
 
@@ -50,7 +51,7 @@ void execute(const char *cmd) {
     info("  %-10s %s", "startup:", getStartupStr());
     info("  %-10s %s", "uptime:", getUptimeStr());
   } else if (strcmp(cmd, "ls") == 0) {
-    info("TODO");
+    fsList(LittleFS, "/", "");
   } else {
     info("UNKNOWN COMMAND: %s", cmd);
   }
diff --git a/src/main.cpp b/src/main.cpp
index 24e6838..65332bc 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -9,7 +9,7 @@
 void setup() {
   logSetup();
   bootDelay();
-  filesystemMount();
+  fsMount();
   httpSetup();
   appStart(APP_MATCH_NAME);
 }