diff --git a/shell_and_utilities/README.md b/shell_and_utilities/README.md
index ffda3a5..1926a4f 100644
--- a/shell_and_utilities/README.md
+++ b/shell_and_utilities/README.md
@@ -211,3 +211,32 @@
 true truncate tty tunctl ulimit umount uname uniq unix2dos unlink
 unshare uptime usleep uudecode uuencode uuidgen vconfig vmstat watch
 wc which whoami xargs xxd yes zcat
+
+## Android R
+
+BSD: grep fsck\_msdos newfs\_msdos
+
+bzip2: bzcat bzip2 bunzip2
+
+one-true-awk: awk
+
+toolbox: getevent getprop setprop start stop
+
+toybox: acpi base64 basename bc blkid blockdev cal cat chattr chcon chgrp
+chmod chown chroot chrt cksum clear cmp comm cp cpio cut date dd df
+diff dirname dmesg dos2unix du echo egrep env expand expr fallocate
+false fgrep file find flock fmt free freeramdisk fsfreeze getconf
+getenforce getfattr grep groups gunzip gzip head help hostname hwclock
+i2cdetect i2cdump i2cget i2cset iconv id ifconfig inotifyd insmod
+install ionice iorenice iotop kill killall ln load\_policy log logname
+losetup ls lsattr lsmod lsof lspci lsusb makedevs md5sum microcom
+mkdir mkfifo mknod mkswap mktemp modinfo modprobe more mount mountpoint
+mv nbd-client nc netcat netstat nice nl nohup nproc nsenter od partprobe
+paste patch pgrep pidof ping ping6 pivot\_root pkill pmap printenv
+printf prlimit ps pwd pwdx readlink realpath renice restorecon rev
+rfkill rm rmdir rmmod runcon sed sendevent seq setenforce setfattr
+setsid sha1sum sha224sum sha256sum sha384sum sha512sum sleep sort split
+stat strings stty swapoff swapon sync sysctl tac tail tar taskset tee
+time timeout top touch tr traceroute traceroute6 true truncate tty tunctl
+ulimit umount uname uniq unix2dos unlink unshare uptime usleep uudecode
+uuencode uuidgen vconfig vmstat watch wc which whoami xargs xxd yes zcat
diff --git a/toolbox/Android.bp b/toolbox/Android.bp
index 5289976..9ca5607 100644
--- a/toolbox/Android.bp
+++ b/toolbox/Android.bp
@@ -28,6 +28,8 @@
         "toolbox.c",
         "getevent.c",
         "getprop.cpp",
+        "setprop.cpp",
+        "start.cpp",
     ],
     generated_headers: [
         "toolbox_input_labels",
@@ -40,6 +42,9 @@
     symlinks: [
         "getevent",
         "getprop",
+        "setprop",
+        "start",
+        "stop",
     ],
 }
 
diff --git a/toolbox/setprop.cpp b/toolbox/setprop.cpp
new file mode 100644
index 0000000..acf8c3e
--- /dev/null
+++ b/toolbox/setprop.cpp
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <sys/system_properties.h>
+
+#include <iostream>
+
+#include <android-base/properties.h>
+#include <android-base/strings.h>
+
+using android::base::SetProperty;
+using android::base::StartsWith;
+
+extern "C" int setprop_main(int argc, char** argv) {
+    if (argc != 3) {
+        std::cout << "usage: setprop NAME VALUE\n"
+                     "\n"
+                     "Sets an Android system property."
+                  << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    auto name = std::string{argv[1]};
+    auto value = std::string{argv[2]};
+
+    // SetProperty() doesn't tell us why it failed, and actually can't recognize most failures, so
+    // we duplicate some of init's checks here to help the user.
+
+    if (name.front() == '.' || name.back() == '.') {
+        std::cerr << "Property names must not start or end with a '.'" << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    if (name.find("..") != std::string::npos) {
+        std::cerr << "'..' is not allowed in a property name" << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    for (const auto& c : name) {
+        if (!isalnum(c) && !strchr(":@_.-", c)) {
+            std::cerr << "Invalid character '" << c << "' in name '" << name << "'" << std::endl;
+            return EXIT_FAILURE;
+        }
+    }
+
+    if (value.size() >= PROP_VALUE_MAX && !StartsWith(value, "ro.")) {
+        std::cerr << "Value '" << value << "' is too long, " << value.size()
+                  << " bytes vs a max of " << PROP_VALUE_MAX << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    if (mbstowcs(nullptr, value.data(), 0) == static_cast<std::size_t>(-1)) {
+        std::cerr << "Value '" << value << "' is not a UTF8 encoded string" << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    if (!SetProperty(name, value)) {
+        std::cerr << "Failed to set property '" << name << "' to '" << value
+                  << "'.\nSee dmesg for error reason." << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    return EXIT_SUCCESS;
+}
\ No newline at end of file
diff --git a/toolbox/start.cpp b/toolbox/start.cpp
new file mode 100644
index 0000000..b87ed15
--- /dev/null
+++ b/toolbox/start.cpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include <android-base/properties.h>
+
+using android::base::GetProperty;
+using android::base::SetProperty;
+using namespace std::literals;
+
+static void ControlService(bool start, const std::string& service) {
+    if (!android::base::SetProperty(start ? "ctl.start" : "ctl.stop", service)) {
+        std::cerr << "Unable to " << (start ? "start" : "stop") << " service '" << service
+                  << "'\nSee dmesg for error reason." << std::endl;
+        exit(EXIT_FAILURE);
+    }
+}
+
+static void ControlDefaultServices(bool start) {
+    std::vector<std::string> services = {"netd", "surfaceflinger", "zygote"};
+
+    // Only start zygote_secondary if not single arch.
+    std::string zygote_configuration = GetProperty("ro.zygote", "");
+    if (zygote_configuration != "zygote32" && zygote_configuration != "zygote64") {
+        services.emplace_back("zygote_secondary");
+    }
+
+    if (start) {
+        for (const auto& service : services) {
+            ControlService(true, service);
+        }
+    } else {
+        for (auto it = services.crbegin(); it != services.crend(); ++it) {
+            ControlService(false, *it);
+        }
+    }
+}
+
+static int StartStop(int argc, char** argv, bool start) {
+    if (getuid()) {
+        std::cerr << "Must be root" << std::endl;
+        return EXIT_FAILURE;
+    }
+
+    if (argc == 1) {
+        ControlDefaultServices(start);
+    }
+
+    if (argc == 2 && argv[1] == "--help"s) {
+        std::cout << "usage: " << (start ? "start" : "stop")
+                  << " [SERVICE...]\n"
+                     "\n"
+                  << (start ? "Starts" : "Stops")
+                  << " the given system service, or netd/surfaceflinger/zygotes." << std::endl;
+        return EXIT_SUCCESS;
+    }
+
+    for (int i = 1; i < argc; ++i) {
+        ControlService(start, argv[i]);
+    }
+    return EXIT_SUCCESS;
+}
+
+extern "C" int start_main(int argc, char** argv) {
+    return StartStop(argc, argv, true);
+}
+
+extern "C" int stop_main(int argc, char** argv) {
+    return StartStop(argc, argv, false);
+}
\ No newline at end of file
diff --git a/toolbox/tools.h b/toolbox/tools.h
index abeb3ef..9a7ebd2 100644
--- a/toolbox/tools.h
+++ b/toolbox/tools.h
@@ -1,3 +1,6 @@
 TOOL(getevent)
 TOOL(getprop)
+TOOL(setprop)
+TOOL(start)
+TOOL(stop)
 TOOL(toolbox)