diff --git a/build.gradle b/build.gradle
index da17920b4..9b417c9fa 100644
--- a/build.gradle
+++ b/build.gradle
@@ -8,7 +8,7 @@ android {
         applicationId "com.topjohnwu.magisk"
         minSdkVersion 21
         targetSdkVersion 27
-        versionCode 94
+        versionCode 96
         versionName "5.5.5"
         javaCompileOptions {
             annotationProcessorOptions {
@@ -46,7 +46,7 @@ repositories {
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
     implementation project(':utils')
-    implementation 'com.github.topjohnwu:libsu:1.0.1'
+    implementation 'com.github.topjohnwu:libsu:1.1.0'
     implementation 'com.android.support:recyclerview-v7:27.0.2'
     implementation 'com.android.support:cardview-v7:27.0.2'
     implementation 'com.android.support:design:27.0.2'
diff --git a/src/main/assets/changelog.md b/src/main/assets/changelog.md
index 10ae4b44b..2d157d1e9 100644
--- a/src/main/assets/changelog.md
+++ b/src/main/assets/changelog.md
@@ -1,4 +1,3 @@
-### v5.5.5 (93)
+### v5.5.5 (96)
 - Remove JNI requirement, Magisk Manager is now pure Java
-- Update the method to handle global su database (v15+), should fix root request not saving issue
-on many devices
+- Update the method handling su database (v15+), may fix the issue that root requests won't save
diff --git a/src/main/java/com/topjohnwu/magisk/MagiskManager.java b/src/main/java/com/topjohnwu/magisk/MagiskManager.java
index 366fb07f1..bf6af5725 100644
--- a/src/main/java/com/topjohnwu/magisk/MagiskManager.java
+++ b/src/main/java/com/topjohnwu/magisk/MagiskManager.java
@@ -8,6 +8,7 @@ import android.content.res.Resources;
 import android.os.Handler;
 import android.preference.PreferenceManager;
 import android.support.annotation.NonNull;
+import android.text.TextUtils;
 import android.widget.Toast;
 
 import com.topjohnwu.magisk.container.Module;
@@ -16,8 +17,10 @@ import com.topjohnwu.magisk.database.SuDatabaseHelper;
 import com.topjohnwu.magisk.utils.Const;
 import com.topjohnwu.magisk.utils.Topic;
 import com.topjohnwu.magisk.utils.Utils;
+import com.topjohnwu.superuser.BusyBox;
 import com.topjohnwu.superuser.Shell;
 
+import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.lang.ref.WeakReference;
@@ -86,26 +89,28 @@ public class MagiskManager extends Shell.ContainerApp {
 
     public MagiskManager() {
         weakSelf = new WeakReference<>(this);
-        Shell.setFlags(Shell.FLAG_MOUNT_MASTER);
-        Shell.setInitializer(new Shell.Initializer() {
-            @Override
-            public void onRootShellInit(@NonNull Shell shell) {
-                try (InputStream in  = MagiskManager.get().getAssets().open(Const.UTIL_FUNCTIONS)) {
-                    shell.loadInputStream(null, null, in);
-                } catch (IOException e) {
-                    e.printStackTrace();
-                }
-                shell.run(null, null,
-                        "export PATH=" + Const.BUSYBOX_PATH + ":$PATH",
-                        "mount_partitions",
-                        "run_migrations");
-            }
-        });
     }
 
     @Override
     public void onCreate() {
         super.onCreate();
+
+        Shell.setFlags(Shell.FLAG_MOUNT_MASTER);
+        BusyBox.BB_PATH = new File(Const.BUSYBOX_PATH);
+        Shell.setInitializer(new Shell.Initializer() {
+            @Override
+            public void onRootShellInit(@NonNull Shell shell) {
+                try (InputStream in = MagiskManager.get().getAssets().open(Const.UTIL_FUNCTIONS)) {
+                    shell.loadInputStream(null, null, in);
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+                shell.run(null, null,
+                        "mount_partitions",
+                        "run_migrations");
+            }
+        });
+
         prefs = PreferenceManager.getDefaultSharedPreferences(this);
 
         // Handle duplicate package
@@ -163,8 +168,8 @@ public class MagiskManager extends Shell.ContainerApp {
         prefs.edit()
                 .putBoolean(Const.Key.DARK_THEME, isDarkTheme)
                 .putBoolean(Const.Key.MAGISKHIDE, magiskHide)
-                .putBoolean(Const.Key.HOSTS, Utils.itemExist(Const.MAGISK_HOST_FILE()))
-                .putBoolean(Const.Key.COREONLY, Utils.itemExist(Const.MAGISK_DISABLE_FILE))
+                .putBoolean(Const.Key.HOSTS, Const.MAGISK_HOST_FILE().exists())
+                .putBoolean(Const.Key.COREONLY, Const.MAGISK_DISABLE_FILE.exists())
                 .putString(Const.Key.SU_REQUEST_TIMEOUT, String.valueOf(suRequestTimeout))
                 .putString(Const.Key.SU_AUTO_RESPONSE, String.valueOf(suResponseType))
                 .putString(Const.Key.SU_NOTIFICATION, String.valueOf(suNotificationType))
@@ -188,64 +193,22 @@ public class MagiskManager extends Shell.ContainerApp {
     }
 
     public void loadMagiskInfo() {
-        List<String> ret;
-        ret = Shell.Sync.sh("magisk -v");
-        if (!Utils.isValidShellResponse(ret)) {
-            ret = Shell.Sync.sh("getprop magisk.version");
-            if (Utils.isValidShellResponse(ret)) {
-                try {
-                    magiskVersionString = ret.get(0);
-                    magiskVersionCode = (int) Double.parseDouble(ret.get(0)) * 10;
-                } catch (NumberFormatException ignored) {}
-            }
-        } else {
-            magiskVersionString = ret.get(0).split(":")[0];
-            ret = Shell.Sync.sh("magisk -V");
-            try {
-                magiskVersionCode = Integer.parseInt(ret.get(0));
-            } catch (NumberFormatException ignored) {}
-        }
-        if (magiskVersionCode > 1435) {
-            ret = Shell.Sync.su("resetprop -p " + Const.MAGISKHIDE_PROP);
-        } else {
-            ret = Shell.Sync.sh("getprop " + Const.MAGISKHIDE_PROP);
-        }
         try {
-            magiskHide = !Utils.isValidShellResponse(ret) || Integer.parseInt(ret.get(0)) != 0;
-        } catch (NumberFormatException e) {
-            magiskHide = true;
-        }
+            magiskVersionString = Utils.cmd("magisk -v").split(":")[0];
+            magiskVersionCode = Integer.parseInt(Utils.cmd("magisk -V"));
+            String s = Utils.cmd((magiskVersionCode > 1435 ? "resetprop -p " : "getprop ") + Const.MAGISKHIDE_PROP);
+            magiskHide = s == null || Integer.parseInt(s) != 0;
+        } catch (Exception ignored) {}
 
-        ret = Shell.Sync.su("echo \"$BOOTIMAGE\"");
-        if (Utils.isValidShellResponse(ret))
-            bootBlock = ret.get(0);
+        bootBlock = Utils.cmd("echo \"$BOOTIMAGE\"");
     }
 
     public void getDefaultInstallFlags() {
-        List<String> ret;
-        ret = Shell.Sync.su("echo \"$DTBOIMAGE\"");
-        if (Utils.isValidShellResponse(ret))
-            keepVerity = true;
+        keepVerity = Boolean.parseBoolean(Utils.cmd("getvar KEEPVERITY; echo $KEEPVERITY")) ||
+                Utils.cmd("echo \"$DTBOIMAGE\"") != null;
 
-        ret = Shell.Sync.su(
-                "getvar KEEPVERITY",
-                "echo $KEEPVERITY");
-        try {
-            if (Utils.isValidShellResponse(ret))
-                keepVerity = Boolean.parseBoolean(ret.get(0));
-        } catch (NumberFormatException ignored) {}
-
-        ret = Shell.Sync.sh("getprop ro.crypto.state");
-        if (Utils.isValidShellResponse(ret) && ret.get(0).equals("encrypted"))
-            keepEnc = true;
-
-        ret = Shell.Sync.su(
-                "getvar KEEPFORCEENCRYPT",
-                "echo $KEEPFORCEENCRYPT");
-        try {
-            if (Utils.isValidShellResponse(ret))
-                keepEnc = Boolean.parseBoolean(ret.get(0));
-        } catch (NumberFormatException ignored) {}
+        keepEnc = Boolean.parseBoolean(Utils.cmd("getvar KEEPFORCEENCRYPT; echo $KEEPFORCEENCRYPT")) ||
+                TextUtils.equals("encrypted", Utils.cmd("getprop ro.crypto.state"));
     }
 
     public void setPermissionGrantCallback(Runnable callback) {
diff --git a/src/main/java/com/topjohnwu/magisk/SettingsActivity.java b/src/main/java/com/topjohnwu/magisk/SettingsActivity.java
index 5599d2308..6b4c15b94 100644
--- a/src/main/java/com/topjohnwu/magisk/SettingsActivity.java
+++ b/src/main/java/com/topjohnwu/magisk/SettingsActivity.java
@@ -27,6 +27,7 @@ import com.topjohnwu.magisk.utils.Topic;
 import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.superuser.Shell;
 
+import java.io.IOException;
 import java.util.Locale;
 
 import butterknife.BindView;
@@ -223,9 +224,11 @@ public class SettingsActivity extends Activity implements Topic.Subscriber {
                     break;
                 case Const.Key.COREONLY:
                     if (prefs.getBoolean(key, false)) {
-                        Utils.createFile(Const.MAGISK_DISABLE_FILE);
+                        try {
+                            Const.MAGISK_DISABLE_FILE.createNewFile();
+                        } catch (IOException ignored) {}
                     } else {
-                        Utils.removeItem(Const.MAGISK_DISABLE_FILE);
+                        Const.MAGISK_DISABLE_FILE.delete();
                     }
                     Toast.makeText(getActivity(), R.string.settings_reboot_toast, Toast.LENGTH_LONG).show();
                     break;
diff --git a/src/main/java/com/topjohnwu/magisk/asyncs/CheckSafetyNet.java b/src/main/java/com/topjohnwu/magisk/asyncs/CheckSafetyNet.java
index 376f5e97d..8899755b5 100644
--- a/src/main/java/com/topjohnwu/magisk/asyncs/CheckSafetyNet.java
+++ b/src/main/java/com/topjohnwu/magisk/asyncs/CheckSafetyNet.java
@@ -4,9 +4,9 @@ import android.app.Activity;
 
 import com.topjohnwu.magisk.MagiskManager;
 import com.topjohnwu.magisk.utils.Const;
-import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.magisk.utils.WebService;
 import com.topjohnwu.superuser.Shell;
+import com.topjohnwu.superuser.ShellUtils;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
@@ -38,7 +38,7 @@ public class CheckSafetyNet extends ParallelTask<Void, Void, Exception> {
         try (
                 OutputStream out = new BufferedOutputStream(new FileOutputStream(dexPath));
                 InputStream in = new BufferedInputStream(conn.getInputStream())) {
-            Utils.inToOut(in, out);
+            ShellUtils.pump(in, out);
         }
         conn.disconnect();
     }
diff --git a/src/main/java/com/topjohnwu/magisk/asyncs/FlashZip.java b/src/main/java/com/topjohnwu/magisk/asyncs/FlashZip.java
index 707876e6b..dbee3e03d 100644
--- a/src/main/java/com/topjohnwu/magisk/asyncs/FlashZip.java
+++ b/src/main/java/com/topjohnwu/magisk/asyncs/FlashZip.java
@@ -11,6 +11,7 @@ import com.topjohnwu.magisk.utils.Const;
 import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.magisk.utils.ZipUtils;
 import com.topjohnwu.superuser.Shell;
+import com.topjohnwu.superuser.ShellUtils;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
@@ -38,8 +39,8 @@ public class FlashZip extends ParallelTask<Void, Void, Integer> {
 
     private boolean unzipAndCheck() throws Exception {
         ZipUtils.unzip(mCachedFile, mCachedFile.getParentFile(), "META-INF/com/google/android", true);
-        List<String> ret = Utils.readFile(new File(mCachedFile.getParentFile(), "updater-script"));
-        return Utils.isValidShellResponse(ret) && ret.get(0).contains("#MAGISK");
+        String s = Utils.cmd("head -n 1 " + new File(mCachedFile.getParentFile(), "updater-script"));
+        return s != null && s.contains("#MAGISK");
     }
 
     @Override
@@ -55,7 +56,7 @@ public class FlashZip extends ParallelTask<Void, Void, Integer> {
             ) {
                 if (in == null) throw new FileNotFoundException();
                 InputStream buf= new BufferedInputStream(in);
-                Utils.inToOut(buf, out);
+                ShellUtils.pump(buf, out);
             } catch (FileNotFoundException e) {
                 console.add("! Invalid Uri");
                 throw e;
@@ -65,7 +66,7 @@ public class FlashZip extends ParallelTask<Void, Void, Integer> {
             }
             if (!unzipAndCheck()) return 0;
             console.add("- Installing " + Utils.getNameFromUri(mm, mUri));
-            Shell.getShell().run(console, logs,
+            Shell.Sync.su(console, logs,
                     "cd " + mCachedFile.getParent(),
                     "BOOTMODE=true sh update-binary dummy 1 " + mCachedFile + " || echo 'Failed!'"
             );
diff --git a/src/main/java/com/topjohnwu/magisk/asyncs/HideManager.java b/src/main/java/com/topjohnwu/magisk/asyncs/HideManager.java
index 262a4ae93..5ac8939d0 100644
--- a/src/main/java/com/topjohnwu/magisk/asyncs/HideManager.java
+++ b/src/main/java/com/topjohnwu/magisk/asyncs/HideManager.java
@@ -10,12 +10,12 @@ import com.topjohnwu.magisk.utils.Const;
 import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.magisk.utils.ZipUtils;
 import com.topjohnwu.superuser.Shell;
+import com.topjohnwu.superuser.ShellUtils;
 import com.topjohnwu.utils.JarMap;
 
 import java.io.File;
 import java.io.FileInputStream;
 import java.security.SecureRandom;
-import java.util.List;
 import java.util.jar.JarEntry;
 
 public class HideManager extends ParallelTask<Void, Void, Boolean> {
@@ -130,12 +130,11 @@ public class HideManager extends ParallelTask<Void, Void, Boolean> {
         }
 
         // Install the application
-
-        List<String> ret = Shell.Sync.su(Utils.fmt("pm install %s >/dev/null && echo true || echo false", repack));
-        repack.delete();
-        if (!Utils.isValidShellResponse(ret) || !Boolean.parseBoolean(ret.get(0)))
+        if (ShellUtils.fastCmdResult(Shell.getShell(), "pm install " + repack))
             return false;
 
+        repack.delete();
+
         mm.suDB.setStrings(Const.Key.SU_REQUESTER, pkg);
         Utils.dumpPrefs();
         Utils.uninstallPkg(Const.ORIG_PKG_NAME);
diff --git a/src/main/java/com/topjohnwu/magisk/asyncs/InstallMagisk.java b/src/main/java/com/topjohnwu/magisk/asyncs/InstallMagisk.java
index 8a0d6d7af..e1d8555eb 100644
--- a/src/main/java/com/topjohnwu/magisk/asyncs/InstallMagisk.java
+++ b/src/main/java/com/topjohnwu/magisk/asyncs/InstallMagisk.java
@@ -1,7 +1,6 @@
 package com.topjohnwu.magisk.asyncs;
 
 import android.app.Activity;
-import android.content.res.AssetManager;
 import android.net.Uri;
 import android.os.Build;
 import android.text.TextUtils;
@@ -14,6 +13,9 @@ import com.topjohnwu.magisk.utils.Const;
 import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.magisk.utils.ZipUtils;
 import com.topjohnwu.superuser.Shell;
+import com.topjohnwu.superuser.ShellUtils;
+import com.topjohnwu.superuser.io.SuFile;
+import com.topjohnwu.superuser.io.SuFileInputStream;
 import com.topjohnwu.utils.SignBoot;
 
 import org.kamranzafar.jtar.TarInputStream;
@@ -28,7 +30,6 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
@@ -70,7 +71,7 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
                         mm.createDeviceProtectedStorageContext() :
                         mm).getFilesDir().getParent()
                 , "install");
-        Shell.Async.sh("rm -rf " + install);
+        Shell.Sync.sh("rm -rf " + install);
 
         List<String> abis = Arrays.asList(Build.SUPPORTED_ABIS);
         String arch;
@@ -108,11 +109,9 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
             boolean highCompression = false;
             switch (mode) {
                 case PATCH_MODE:
-                    console.add("- Use boot/ramdisk image: " + boot);
                     // Copy boot image to local
-                    try (
-                        InputStream in = mm.getContentResolver().openInputStream(mBootImg);
-                        OutputStream out = new FileOutputStream(boot)
+                    try (InputStream in = mm.getContentResolver().openInputStream(mBootImg);
+                         OutputStream out = new FileOutputStream(boot)
                     ) {
                         InputStream source;
                         if (in == null) throw new FileNotFoundException();
@@ -130,7 +129,7 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
                             // Direct copy raw image
                             source = new BufferedInputStream(in);
                         }
-                        Utils.inToOut(source, out);
+                        ShellUtils.pump(source, out);
                     } catch (FileNotFoundException e) {
                         console.add("! Invalid Uri");
                         throw e;
@@ -140,18 +139,13 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
                     }
                     break;
                 case DIRECT_MODE:
-                    console.add("- Use boot/ramdisk image: " + mBootLocation);
+                    console.add("- Patch boot/ramdisk image: " + mBootLocation);
                     if (mm.remoteMagiskVersionCode >= 1463) {
-                        List<String> ret = new ArrayList<>();
-                         Shell.getShell().run(ret, logs,
-                                install + "/magiskboot --parse " + mBootLocation,
-                                "echo $?"
-                        );
-                        if (Utils.isValidShellResponse(ret)) {
-                            highCompression = Integer.parseInt(ret.get(ret.size() - 1)) == 2;
-                            if (highCompression)
-                                console.add("! Insufficient boot partition size detected");
-                        }
+                        highCompression = Integer.parseInt(Utils.cmd(Utils.fmt(
+                                "%s/magiskboot --parse %s; echo $?",
+                                install, mBootLocation))) == 2;
+                        if (highCompression)
+                            console.add("! Insufficient boot partition size detected");
                     }
                     if (boot.createNewFile()) {
                         Shell.Sync.su("cat " + mBootLocation + " > " + boot);
@@ -175,15 +169,8 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
                 throw e;
             }
 
-            // Force non-root shell
-            Shell shell;
-            if (Shell.rootAccess())
-                shell = Shell.newInstance("sh");
-            else
-                shell = Shell.getShell();
-
             // Patch boot image
-            shell.run(console, logs,
+            Shell.Sync.sh(console, logs,
                     "cd " + install,
                     Utils.fmt("KEEPFORCEENCRYPT=%b KEEPVERITY=%b HIGHCOMP=%b " +
                                     "sh update-binary indep boot_patch.sh %s || echo 'Failed!'",
@@ -192,24 +179,22 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
             if (TextUtils.equals(console.get(console.size() - 1), "Failed!"))
                 return false;
 
-            shell.run(null, null, "mv -f new-boot.img ../",
+            Shell.Sync.sh("mv -f new-boot.img ../",
                     "mv bin/busybox busybox",
                     "rm -rf bin *.img update-binary",
                     "cd /");
 
-            File patched_boot = new File(install.getParent(), "new-boot.img");
+            SuFile patched_boot = new SuFile(install.getParent(), "new-boot.img");
 
             if (isSigned) {
                 console.add("- Signing boot image with test keys");
                 File signed = new File(install.getParent(), "signed.img");
-                AssetManager assets = mm.getAssets();
-                try (
-                        InputStream in = new FileInputStream(patched_boot);
-                        OutputStream out = new BufferedOutputStream(new FileOutputStream(signed))
+                try (InputStream in = new SuFileInputStream(patched_boot);
+                     OutputStream out = new BufferedOutputStream(new FileOutputStream(signed))
                 ) {
                     SignBoot.doSignature("/boot", in, out, null, null);
                 }
-                shell.run(null, null, "mv -f " + signed + " " + patched_boot);
+                Shell.Sync.sh("mv -f " + signed + " " + patched_boot);
             }
 
             switch (mode) {
@@ -227,8 +212,8 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
                             out = new BufferedOutputStream(new FileOutputStream(dest));
                             break;
                     }
-                    try (InputStream in = new BufferedInputStream(new FileInputStream(patched_boot))) {
-                        Utils.inToOut(in, out);
+                    try (InputStream in = new SuFileInputStream(patched_boot)) {
+                        ShellUtils.pump(in, out);
                         out.close();
                     }
                     console.add("");
@@ -239,7 +224,7 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
                     break;
                 case DIRECT_MODE:
                     String binPath = mm.remoteMagiskVersionCode >= 1464 ? "/data/adb/magisk" : "/data/magisk";
-                    Shell.getShell().run(console, logs,
+                    Shell.Sync.su(console, logs,
                             Utils.fmt("rm -rf %s/*; mkdir -p %s; chmod 700 /data/adb", binPath, binPath),
                             Utils.fmt("cp -af %s/* %s; rm -rf %s", install, binPath, install),
                             Utils.fmt("flash_boot_image %s %s", patched_boot, mBootLocation),
diff --git a/src/main/java/com/topjohnwu/magisk/asyncs/MarkDownWindow.java b/src/main/java/com/topjohnwu/magisk/asyncs/MarkDownWindow.java
index d6b7c3ed3..ece1dbc05 100644
--- a/src/main/java/com/topjohnwu/magisk/asyncs/MarkDownWindow.java
+++ b/src/main/java/com/topjohnwu/magisk/asyncs/MarkDownWindow.java
@@ -6,8 +6,8 @@ import android.webkit.WebView;
 
 import com.topjohnwu.magisk.MagiskManager;
 import com.topjohnwu.magisk.R;
-import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.magisk.utils.WebService;
+import com.topjohnwu.superuser.ShellUtils;
 
 import org.commonmark.node.Node;
 import org.commonmark.parser.Parser;
@@ -44,7 +44,7 @@ public class MarkDownWindow extends ParallelTask<Void, Void, String> {
             md = WebService.getString(mUrl);
         } else {
             try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
-                Utils.inToOut(is, out);
+                ShellUtils.pump(is, out);
                 md = out.toString();
                 is.close();
             } catch (IOException e) {
@@ -57,7 +57,7 @@ public class MarkDownWindow extends ParallelTask<Void, Void, String> {
             InputStream in = mm.getAssets().open(mm.isDarkTheme ? "dark.css" : "light.css");
             ByteArrayOutputStream out = new ByteArrayOutputStream()
         ) {
-            Utils.inToOut(in, out);
+            ShellUtils.pump(in, out);
             css = out.toString();
         } catch (IOException e) {
             e.printStackTrace();
diff --git a/src/main/java/com/topjohnwu/magisk/asyncs/ProcessRepoZip.java b/src/main/java/com/topjohnwu/magisk/asyncs/ProcessRepoZip.java
index 566e191c1..c98addf36 100644
--- a/src/main/java/com/topjohnwu/magisk/asyncs/ProcessRepoZip.java
+++ b/src/main/java/com/topjohnwu/magisk/asyncs/ProcessRepoZip.java
@@ -17,6 +17,7 @@ import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.magisk.utils.WebService;
 import com.topjohnwu.magisk.utils.ZipUtils;
 import com.topjohnwu.superuser.Shell;
+import com.topjohnwu.superuser.ShellUtils;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
@@ -68,7 +69,7 @@ public class ProcessRepoZip extends ParallelTask<Void, Object, Boolean> {
                     continue;
                 }
                 out.putNextEntry(new JarEntry(path));
-                Utils.inToOut(in, out);
+                ShellUtils.pump(in, out);
             }
         }
     }
@@ -107,7 +108,7 @@ public class ProcessRepoZip extends ParallelTask<Void, Object, Boolean> {
                 InputStream in = new BufferedInputStream(new ProgressInputStream(conn.getInputStream()));
                 OutputStream out = new BufferedOutputStream(new FileOutputStream(temp1))
             ) {
-                Utils.inToOut(in, out);
+                ShellUtils.pump(in, out);
                 in.close();
             }
             conn.disconnect();
diff --git a/src/main/java/com/topjohnwu/magisk/asyncs/RestoreImages.java b/src/main/java/com/topjohnwu/magisk/asyncs/RestoreImages.java
index 972acc4b9..e70e3171f 100644
--- a/src/main/java/com/topjohnwu/magisk/asyncs/RestoreImages.java
+++ b/src/main/java/com/topjohnwu/magisk/asyncs/RestoreImages.java
@@ -6,27 +6,22 @@ import com.topjohnwu.magisk.MagiskManager;
 import com.topjohnwu.magisk.R;
 import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.superuser.Shell;
-
-import java.util.List;
+import com.topjohnwu.superuser.ShellUtils;
 
 public class RestoreImages extends ParallelTask<Void, Void, Boolean> {
 
     @Override
     protected Boolean doInBackground(Void... voids) {
         String sha1;
-        List<String> ret = Utils.readFile("/.backup/.sha1");
-        if (Utils.isValidShellResponse(ret)) {
-            sha1 = ret.get(0);
-        } else {
-            ret = Shell.Sync.su("cat /init.magisk.rc | grep STOCKSHA1");
-            if (!Utils.isValidShellResponse(ret))
+        sha1 = Utils.cmd("cat /.backup/.sha1");
+        if (sha1 == null) {
+            sha1 = Utils.cmd("cat /init.magisk.rc | grep STOCKSHA1");
+            if (sha1 == null)
                 return false;
-            sha1 = ret.get(0).substring(ret.get(0).indexOf('=') + 1);
+            sha1 = sha1.substring(sha1.indexOf('=') + 1);
         }
 
-        ret = Shell.Sync.su("restore_imgs " + sha1 + " && echo true || echo false");
-
-        return Utils.isValidShellResponse(ret) && Boolean.parseBoolean(ret.get(ret.size() - 1));
+        return ShellUtils.fastCmdResult(Shell.getShell(), "restore_imgs " + sha1);
     }
 
     @Override
diff --git a/src/main/java/com/topjohnwu/magisk/container/Module.java b/src/main/java/com/topjohnwu/magisk/container/Module.java
index c364f8461..59524bfdb 100644
--- a/src/main/java/com/topjohnwu/magisk/container/Module.java
+++ b/src/main/java/com/topjohnwu/magisk/container/Module.java
@@ -1,21 +1,24 @@
 package com.topjohnwu.magisk.container;
 
-import com.topjohnwu.magisk.utils.Utils;
+import com.topjohnwu.superuser.Shell;
+import com.topjohnwu.superuser.io.SuFile;
+
+import java.io.IOException;
 
 public class Module extends BaseModule {
 
-    private String mRemoveFile, mDisableFile, mUpdateFile;
+    private SuFile mRemoveFile, mDisableFile, mUpdateFile;
     private boolean mEnable, mRemove, mUpdated;
 
     public Module(String path) {
 
         try {
-            parseProps(Utils.readFile(path + "/module.prop"));
+            parseProps(Shell.Sync.su("cat " + path + "/module.prop"));
         } catch (NumberFormatException ignored) {}
 
-        mRemoveFile = path + "/remove";
-        mDisableFile = path + "/disable";
-        mUpdateFile = path + "/update";
+        mRemoveFile = new SuFile(path + "/remove", true);
+        mDisableFile = new SuFile(path + "/disable", true);
+        mUpdateFile = new SuFile(path + "/update", true);
 
         if (getId() == null) {
             int sep = path.lastIndexOf('/');
@@ -26,19 +29,21 @@ public class Module extends BaseModule {
             setName(getId());
         }
 
-        mEnable = !Utils.itemExist(mDisableFile);
-        mRemove = Utils.itemExist(mRemoveFile);
-        mUpdated = Utils.itemExist(mUpdateFile);
+        mEnable = !mDisableFile.exists();
+        mRemove = mRemoveFile.exists();
+        mUpdated = mUpdateFile.exists();
     }
 
     public void createDisableFile() {
         mEnable = false;
-        Utils.createFile(mDisableFile);
+        try {
+            mDisableFile.createNewFile();
+        } catch (IOException ignored) {}
     }
 
     public void removeDisableFile() {
         mEnable = true;
-        Utils.removeItem(mDisableFile);
+        mDisableFile.delete();
     }
 
     public boolean isEnabled() {
@@ -47,12 +52,14 @@ public class Module extends BaseModule {
 
     public void createRemoveFile() {
         mRemove = true;
-        Utils.createFile(mRemoveFile);
+        try {
+            mRemoveFile.createNewFile();
+        } catch (IOException ignored) {}
     }
 
     public void deleteRemoveFile() {
         mRemove = false;
-        Utils.removeItem(mRemoveFile);
+        mRemoveFile.delete();
     }
 
     public boolean willBeRemoved() {
diff --git a/src/main/java/com/topjohnwu/magisk/utils/Const.java b/src/main/java/com/topjohnwu/magisk/utils/Const.java
index 986747f2b..71362c2f2 100644
--- a/src/main/java/com/topjohnwu/magisk/utils/Const.java
+++ b/src/main/java/com/topjohnwu/magisk/utils/Const.java
@@ -4,6 +4,7 @@ import android.os.Environment;
 import android.os.Process;
 
 import com.topjohnwu.magisk.MagiskManager;
+import com.topjohnwu.superuser.io.SuFile;
 
 import java.io.File;
 import java.util.Arrays;
@@ -24,8 +25,8 @@ public class Const {
     public static final String SU_KEYSTORE_KEY = "su_key";
 
     // Paths
-    private static String MAGISK_PATH = null;
-    public static final String MAGISK_DISABLE_FILE = "/cache/.disable_magisk";
+    private static SuFile MAGISK_PATH = null;
+    public static final SuFile MAGISK_DISABLE_FILE = new SuFile("/cache/.disable_magisk", true);
     public static final String BUSYBOX_PATH = "/sbin/.core/busybox";
     public static final String TMP_FOLDER_PATH = "/dev/tmp";
     public static final String MAGISK_LOG = "/cache/magisk.log";
@@ -37,21 +38,23 @@ public class Const {
     public static final int SNET_VER = 7;
     public static final int MIN_MODULE_VER = 1400;
 
-    public synchronized static String MAGISK_PATH() {
+    public synchronized static SuFile MAGISK_PATH() {
+        SuFile file;
         if (MAGISK_PATH == null) {
-            if (Utils.itemExist("/sbin/.core/img")) {
-                MAGISK_PATH = "/sbin/.core/img";
-            } else if (Utils.itemExist("/dev/magisk/img")) {
-                MAGISK_PATH = "/dev/magisk/img";
+            file = new SuFile("/sbin/.core/img", true);
+            if (file.exists()) {
+                MAGISK_PATH = file;
+            } else if ((file = new SuFile("/dev/magisk/img", true)).exists()) {
+                MAGISK_PATH = file;
             } else {
-                MAGISK_PATH = "/magisk";
+                MAGISK_PATH = new SuFile("/magisk", true);
             }
         }
         return MAGISK_PATH;
     }
 
-    public static String MAGISK_HOST_FILE() {
-        return MAGISK_PATH() + "/.core/hosts";
+    public static SuFile MAGISK_HOST_FILE() {
+        return new SuFile(MAGISK_PATH() + "/.core/hosts");
     }
 
     /* A list of apps that should not be shown as hide-able */
diff --git a/src/main/java/com/topjohnwu/magisk/utils/ShowUI.java b/src/main/java/com/topjohnwu/magisk/utils/ShowUI.java
index 004dfa78a..bb02d2a89 100644
--- a/src/main/java/com/topjohnwu/magisk/utils/ShowUI.java
+++ b/src/main/java/com/topjohnwu/magisk/utils/ShowUI.java
@@ -23,6 +23,7 @@ import com.topjohnwu.magisk.receivers.DownloadReceiver;
 import com.topjohnwu.magisk.receivers.ManagerUpdate;
 import com.topjohnwu.magisk.receivers.RebootReceiver;
 import com.topjohnwu.superuser.Shell;
+import com.topjohnwu.superuser.ShellUtils;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -111,11 +112,11 @@ public class ShowUI {
                 if (Shell.rootAccess()) {
                     options.add(mm.getString(R.string.direct_install));
                 }
-                List<String> res = Shell.Sync.su("echo $SLOT");
-                if (Utils.isValidShellResponse(res)) {
+                String s = Utils.cmd("echo $SLOT");
+                if (s != null) {
                     options.add(mm.getString(R.string.install_second_slot));
                 }
-                char[] slot = Utils.isValidShellResponse(res) ? res.get(0).toCharArray() : null;
+                char[] slot = s == null ? null : s.toCharArray();
                 new AlertDialog.Builder(activity)
                     .setTitle(R.string.select_method)
                     .setItems(
@@ -185,12 +186,11 @@ public class ShowUI {
                                     if (slot[1] == 'a') slot[1] = 'b';
                                     else slot[1] = 'a';
                                     // Then find the boot image again
-                                    List<String> ret = Shell.Sync.su(
-                                            "SLOT=" + String.valueOf(slot),
-                                            "find_boot_image",
+                                    boot = Utils.cmd(
+                                            "SLOT=" + String.valueOf(slot) +
+                                            "; find_boot_image;" +
                                             "echo \"$BOOTIMAGE\""
                                     );
-                                    boot = Utils.isValidShellResponse(ret) ? ret.get(ret.size() - 1) : null;
                                     Shell.Async.su("mount_partitions");
                                     if (boot == null)
                                         return;
@@ -253,14 +253,14 @@ public class ShowUI {
             .setPositiveButton(R.string.complete_uninstall, (d, i) -> {
                 ByteArrayOutputStream uninstaller = new ByteArrayOutputStream();
                 try (InputStream in = mm.getAssets().open(Const.UNINSTALLER)) {
-                    Utils.inToOut(in, uninstaller);
+                    ShellUtils.pump(in, uninstaller);
                 } catch (IOException e) {
                     e.printStackTrace();
                     return;
                 }
                 ByteArrayOutputStream utils = new ByteArrayOutputStream();
                 try (InputStream in = mm.getAssets().open(Const.UTIL_FUNCTIONS)) {
-                    Utils.inToOut(in, utils);
+                    ShellUtils.pump(in, utils);
                 } catch (IOException e) {
                     e.printStackTrace();
                     return;
diff --git a/src/main/java/com/topjohnwu/magisk/utils/Utils.java b/src/main/java/com/topjohnwu/magisk/utils/Utils.java
index 918ce60b4..9f6cb79c6 100644
--- a/src/main/java/com/topjohnwu/magisk/utils/Utils.java
+++ b/src/main/java/com/topjohnwu/magisk/utils/Utils.java
@@ -19,7 +19,6 @@ import android.support.annotation.StringRes;
 import android.support.design.widget.Snackbar;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.content.ContextCompat;
-import android.text.TextUtils;
 import android.widget.Toast;
 
 import com.google.gson.Gson;
@@ -31,11 +30,10 @@ import com.topjohnwu.magisk.components.SnackbarMaker;
 import com.topjohnwu.magisk.database.SuDatabaseHelper;
 import com.topjohnwu.magisk.receivers.DownloadReceiver;
 import com.topjohnwu.superuser.Shell;
+import com.topjohnwu.superuser.ShellUtils;
+import com.topjohnwu.superuser.io.SuFile;
 
 import java.io.File;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashSet;
@@ -47,37 +45,8 @@ public class Utils {
 
     public static boolean isDownloading = false;
 
-    public static boolean itemExist(Object path) {
-        List<String> ret = Shell.Sync.su(fmt("[ -e %s ] && echo true || echo false", path));
-        return isValidShellResponse(ret) && Boolean.parseBoolean(ret.get(0));
-    }
-
-    public static void createFile(Object path) {
-        Shell.Async.su(fmt("mkdir -p `dirname '%s'` 2>/dev/null; touch '%s' 2>/dev/null", path, path));
-    }
-
-    public static boolean javaCreateFile(File path) {
-        path.getParentFile().mkdirs();
-        try {
-            path.createNewFile();
-            return true;
-        } catch (IOException e) {
-            e.printStackTrace();
-            return false;
-        }
-    }
-
-    public static void removeItem(Object path) {
-        Shell.Async.su(fmt("rm -rf %s 2>/dev/null", path));
-    }
-
-    public static List<String> readFile(Object path) {
-        return Shell.Sync.su(fmt("cat %s | sed '$a\\ ' | sed '$d'", path));
-    }
-
-    public static String checkInode(Object path) {
-        List<String> ret = Shell.Sync.su(fmt("ls -i %s", path));
-        return isValidShellResponse(ret) ? ret.get(0).trim().split("\\s+")[0] : path.toString();
+    public static String cmd(String cmd) {
+        return ShellUtils.fastCmd(Shell.getShell(), cmd);
     }
 
     public static void uninstallPkg(String pkg) {
@@ -118,16 +87,6 @@ public class Utils {
                 .replace("\\", "_");
     }
 
-    public static boolean isValidShellResponse(List<String> list) {
-        if (list != null && list.size() != 0) {
-            // Check if all empty
-            for (String res : list) {
-                if (!TextUtils.isEmpty(res)) return true;
-            }
-        }
-        return false;
-    }
-
     public static int getPrefsInt(SharedPreferences prefs, String key, int def) {
         return Integer.parseInt(prefs.getString(key, String.valueOf(def)));
     }
@@ -230,14 +189,6 @@ public class Utils {
         }
     }
 
-    public static File getDB(String dbName) {
-        return getDB(MagiskManager.get(), dbName);
-    }
-
-    public static File getDB(Context context, String dbName) {
-        return new File(context.getFilesDir().getParent() + "/databases", dbName);
-    }
-
     public static AssetManager getAssets(String apk) {
         try {
             AssetManager asset = AssetManager.class.newInstance();
@@ -249,22 +200,10 @@ public class Utils {
         }
     }
 
-    public static int inToOut(InputStream in, OutputStream out) throws IOException {
-        int read, total = 0;
-        byte buffer[] = new byte[4096];
-        while ((read = in.read(buffer)) > 0) {
-            out.write(buffer, 0, read);
-            total += read;
-        }
-        out.flush();
-        return total;
-    }
-
     public static void patchDTBO() {
         MagiskManager mm = MagiskManager.get();
         if (mm.magiskVersionCode >= 1446 && !mm.keepVerity) {
-            List<String> ret = Shell.Sync.su("patch_dtbo_image && echo true || echo false");
-            if (Utils.isValidShellResponse(ret) && Boolean.parseBoolean(ret.get(ret.size() - 1))) {
+            if (ShellUtils.fastCmdResult(Shell.getShell(), "patch_dtbo_image")) {
                 ShowUI.dtboPatchedNotification();
             }
         }
@@ -285,9 +224,9 @@ public class Utils {
     }
 
     public static void loadPrefs() {
-        String config = fmt("/data/user/%d/%s", Const.USER_ID, Const.MANAGER_CONFIGS);
-        List<String> ret = readFile(config);
-        if (isValidShellResponse(ret)) {
+        SuFile config = new SuFile(fmt("/data/user/%d/%s", Const.USER_ID, Const.MANAGER_CONFIGS), true);
+        List<String> ret = Shell.Sync.su("cat " + config);
+        if (ShellUtils.isValidOutput(ret)) {
             SharedPreferences.Editor editor = MagiskManager.get().prefs.edit();
             String json = ret.get(0);
             Gson gson = new Gson();
@@ -306,7 +245,7 @@ public class Utils {
             editor.remove(Const.Key.ETAG_KEY);
             editor.apply();
             MagiskManager.get().loadConfig();
-            removeItem(config);
+            config.delete();
         }
     }
 
diff --git a/src/main/java/com/topjohnwu/magisk/utils/ZipUtils.java b/src/main/java/com/topjohnwu/magisk/utils/ZipUtils.java
index 61b41cbcf..628646e0a 100644
--- a/src/main/java/com/topjohnwu/magisk/utils/ZipUtils.java
+++ b/src/main/java/com/topjohnwu/magisk/utils/ZipUtils.java
@@ -1,5 +1,6 @@
 package com.topjohnwu.magisk.utils;
 
+import com.topjohnwu.superuser.ShellUtils;
 import com.topjohnwu.utils.JarMap;
 import com.topjohnwu.utils.SignAPK;
 
@@ -39,7 +40,7 @@ public class ZipUtils {
                 File dest = new File(folder, name);
                 dest.getParentFile().mkdirs();
                 try (FileOutputStream out = new FileOutputStream(dest)) {
-                    Utils.inToOut(zipfile, out);
+                    ShellUtils.pump(zipfile, out);
                 }
             }
         } catch(Exception e) {