diff --git a/src/build.py b/src/build.py
index d45c522a..f8b2f583 100644
--- a/src/build.py
+++ b/src/build.py
@@ -13,6 +13,7 @@ cxxprogram(
         "./fe-format.cc",
         "./fe-fluxfilels.cc",
         "./fe-fluxfilerm.cc",
+        "./fe-fluxfilecp.cc",
         "./fe-getdiskinfo.cc",
         "./fe-getfile.cc",
         "./fe-getfileinfo.cc",
diff --git a/src/fe-fluxfilecp.cc b/src/fe-fluxfilecp.cc
new file mode 100644
index 00000000..0102f918
--- /dev/null
+++ b/src/fe-fluxfilecp.cc
@@ -0,0 +1,84 @@
+#include "lib/core/globals.h"
+#include "lib/config/flags.h"
+#include "lib/data/fluxmap.h"
+#include "lib/data/sector.h"
+#include "lib/config/proto.h"
+#include "lib/data/locations.h"
+#include "lib/data/flux.h"
+#include "lib/external/fl2.h"
+#include "lib/external/fl2.pb.h"
+#include "src/fluxengine.h"
+#include <fstream>
+
+static FlagGroup flags;
+
+static StringFlag inputFilenameFlag({"-i", "--input"}, "input flux file");
+static StringFlag outputFilenameFlag(
+    {"-o", "--output"}, "output flux file (must exist)");
+static StringFlag tracksFlag({"-t", "--tracks"}, "tracks to copy");
+
+static const TrackFluxProto* findTrack(
+    const FluxFileProto& f, int cylinder, int head)
+{
+    for (const auto& trackFlux : f.track())
+        if ((trackFlux.track() == cylinder) && (trackFlux.head() == head))
+            return &trackFlux;
+
+    return nullptr;
+}
+
+static TrackFluxProto* findOrMakeTrack(FluxFileProto& f, int cylinder, int head)
+{
+    for (auto& trackFlux : *f.mutable_track())
+        if ((trackFlux.track() == cylinder) && (trackFlux.head() == head))
+            return &trackFlux;
+
+    TrackFluxProto* tf = f.add_track();
+    tf->set_track(cylinder);
+    tf->set_head(head);
+    return tf;
+}
+
+int mainFluxfileCp(int argc, const char* argv[])
+{
+    flags.parseFlags(argc, argv);
+    if (!inputFilenameFlag.isSet())
+        error("you must specify an input filename with -i");
+    if (!outputFilenameFlag.isSet())
+        error("you must specify an output filename with -o");
+
+    fmt::print(
+        "{} -> {}:\n", inputFilenameFlag.get(), outputFilenameFlag.get());
+    FluxFileProto inf = loadFl2File(inputFilenameFlag.get());
+    FluxFileProto outf = loadFl2File(outputFilenameFlag.get());
+
+    bool changed = false;
+    for (const auto& location : parseCylinderHeadsString(tracksFlag))
+    {
+        const TrackFluxProto* intrack =
+            findTrack(inf, location.cylinder, location.head);
+        if (!intrack)
+        {
+            fmt::print("  location c{}h{} not found\n",
+                location.cylinder,
+                location.head);
+            continue;
+        }
+        TrackFluxProto* outtrack =
+            findOrMakeTrack(outf, location.cylinder, location.head);
+        fmt::print("  copying c{}h{}\n", location.cylinder, location.head);
+        for (const auto& flux : intrack->flux())
+            outtrack->add_flux(flux);
+        changed = true;
+    }
+
+    if (changed)
+    {
+        fmt::print("writing back output file\n");
+        saveFl2File(outputFilenameFlag.get(), outf);
+    }
+    else
+        fmt::print("output file not modified\n");
+
+    return 0;
+}
diff --git a/src/fluxengine.cc b/src/fluxengine.cc
index dcfc64d0..4538712d 100644
--- a/src/fluxengine.cc
+++ b/src/fluxengine.cc
@@ -9,6 +9,7 @@ extern command_cb mainAnalyseLayout;
 extern command_cb mainConvert;
 extern command_cb mainFluxfileLs;
 extern command_cb mainFluxfileRm;
+extern command_cb mainFluxfileCp;
 extern command_cb mainFormat;
 extern command_cb mainGetDiskInfo;
 extern command_cb mainGetFile;
@@ -84,6 +85,7 @@ static std::vector<Command> fluxfileables =
 {
     { "ls",            mainFluxfileLs,           "Lists the contents of a flux file.", },
     { "rm",            mainFluxfileRm,           "Removes flux from a flux file.", },
+    { "cp",            mainFluxfileCp,           "Copies flux from one flux file to another." },
 };
 // clang-format on