diff --git a/app/src/main/java/io/neoterm/preference/NeoPreference.kt b/app/src/main/java/io/neoterm/preference/NeoPreference.kt
index c1ce1b0..d763556 100644
--- a/app/src/main/java/io/neoterm/preference/NeoPreference.kt
+++ b/app/src/main/java/io/neoterm/preference/NeoPreference.kt
@@ -19,6 +19,10 @@ object NeoPreference {
     const val KEY_FONT_SIZE = "neoterm_general_font_size"
     const val KEY_CURRENT_SESSION = "neoterm_service_current_session"
 
+    const val VALUE_NEOTERM_ONLY = "NeoTermOnly"
+    const val VALUE_NEOTERM_FIRST = "NeoTermFirst"
+    const val VALUE_SYSTEM_FIRST = "SystemFirst"
+
     var preference: SharedPreferences? = null
     var context: Context? = null
 
@@ -114,11 +118,10 @@ object NeoPreference {
             return arrayOf(termEnv, homeEnv, androidRootEnv, androidDataEnv, externalStorageEnv, pathEnv)
 
         } else {
-
             val ps1Env = "PS1=$ "
-            val ldEnv = "LD_LIBRARY_PATH=${NeoTermPath.USR_PATH}/lib"
             val langEnv = "LANG=en_US.UTF-8"
-            val pathEnv = "PATH=${NeoTermPath.USR_PATH}/bin:${NeoTermPath.USR_PATH}/bin/applets"
+            val pathEnv = "PATH=" + buildPathEnv()
+            val ldEnv = "LD_LIBRARY_PATH=" + buildLdLibraryEnv()
             val pwdEnv = "PWD=" + cwd
             val tmpdirEnv = "TMPDIR=${NeoTermPath.USR_PATH}/tmp"
 
@@ -126,6 +129,39 @@ object NeoPreference {
         }
     }
 
+    private fun buildLdLibraryEnv(): String {
+        val builder = StringBuilder("${NeoTermPath.USR_PATH}/lib")
+
+        val programSelection = NeoPreference.loadString(R.string.key_general_program_selection, VALUE_NEOTERM_ONLY)
+        val systemPath = System.getenv("LD_LIBRARY_PATH")
+
+        if (programSelection != VALUE_NEOTERM_ONLY) {
+            builder.append(":$systemPath")
+        }
+
+        return builder.toString()
+    }
+
+    private fun buildPathEnv(): String {
+        val builder = StringBuilder()
+        val programSelection = NeoPreference.loadString(R.string.key_general_program_selection, VALUE_NEOTERM_ONLY)
+        val basePath = "${NeoTermPath.USR_PATH}/bin:${NeoTermPath.USR_PATH}/bin/applets"
+        val systemPath = System.getenv("PATH")
+
+        when (programSelection) {
+            VALUE_NEOTERM_ONLY -> {
+                builder.append(basePath)
+            }
+            VALUE_NEOTERM_FIRST -> {
+                builder.append("$basePath:$systemPath")
+            }
+            VALUE_SYSTEM_FIRST -> {
+                builder.append("$systemPath:$basePath")
+            }
+        }
+        return builder.toString()
+    }
+
     /**
      * TODO
      * To print the job name about to be executed in bash:
diff --git a/app/src/main/java/io/neoterm/services/NeoTermService.kt b/app/src/main/java/io/neoterm/services/NeoTermService.kt
index 0822d5a..cee1b2a 100644
--- a/app/src/main/java/io/neoterm/services/NeoTermService.kt
+++ b/app/src/main/java/io/neoterm/services/NeoTermService.kt
@@ -132,6 +132,10 @@ class NeoTermService : Service() {
         builder.setOngoing(true)
         builder.setShowWhen(false)
         builder.setColor(0xFF000000.toInt())
+
+        val exitIntent = Intent(this, NeoTermService::class.java).setAction(ACTION_SERVICE_STOP)
+        builder.addAction(android.R.drawable.ic_delete, "Exit", PendingIntent.getService(this, 0, exitIntent, 0))
+
         return builder.build()
     }
 
diff --git a/app/src/main/java/io/neoterm/view/ExtraKeysView.java b/app/src/main/java/io/neoterm/view/ExtraKeysView.java
index d0cb8cc..2cc685e 100755
--- a/app/src/main/java/io/neoterm/view/ExtraKeysView.java
+++ b/app/src/main/java/io/neoterm/view/ExtraKeysView.java
@@ -24,8 +24,16 @@ import io.neoterm.view.eks.ControlButton;
 import io.neoterm.view.eks.ExtraButton;
 import io.neoterm.view.eks.StatedControlButton;
 
+import static io.neoterm.view.eks.ExtraButton.KEY_ARROW_DOWN;
+import static io.neoterm.view.eks.ExtraButton.KEY_ARROW_LEFT;
+import static io.neoterm.view.eks.ExtraButton.KEY_ARROW_RIGHT;
+import static io.neoterm.view.eks.ExtraButton.KEY_ARROW_UP;
 import static io.neoterm.view.eks.ExtraButton.KEY_CTRL;
+import static io.neoterm.view.eks.ExtraButton.KEY_END;
 import static io.neoterm.view.eks.ExtraButton.KEY_ESC;
+import static io.neoterm.view.eks.ExtraButton.KEY_HOME;
+import static io.neoterm.view.eks.ExtraButton.KEY_PAGE_DOWN;
+import static io.neoterm.view.eks.ExtraButton.KEY_PAGE_UP;
 import static io.neoterm.view.eks.ExtraButton.KEY_TAB;
 
 /**
@@ -34,14 +42,17 @@ import static io.neoterm.view.eks.ExtraButton.KEY_TAB;
  */
 public final class ExtraKeysView extends LinearLayout {
 
+    public static final StatedControlButton CTRL = new StatedControlButton(KEY_CTRL);
     public static final ControlButton ESC = new ControlButton(KEY_ESC);
     public static final ControlButton TAB = new ControlButton(KEY_TAB);
-    public static final StatedControlButton CTRL = new StatedControlButton(KEY_CTRL);
-
-    public static final ControlButton ARROW_UP = new ControlButton("▲");
-    public static final ControlButton ARROW_DOWN = new ControlButton("▼");
-    public static final ControlButton ARROW_LEFT = new ControlButton("◀");
-    public static final ControlButton ARROW_RIGHT = new ControlButton("▶");
+    public static final ControlButton PAGE_UP = new ControlButton(KEY_PAGE_UP);
+    public static final ControlButton PAGE_DOWN = new ControlButton(KEY_PAGE_DOWN);
+    public static final ControlButton HOME = new ControlButton(KEY_HOME);
+    public static final ControlButton END = new ControlButton(KEY_END);
+    public static final ControlButton ARROW_UP = new ControlButton(KEY_ARROW_UP);
+    public static final ControlButton ARROW_DOWN = new ControlButton(KEY_ARROW_DOWN);
+    public static final ControlButton ARROW_LEFT = new ControlButton(KEY_ARROW_LEFT);
+    public static final ControlButton ARROW_RIGHT = new ControlButton(KEY_ARROW_RIGHT);
 
     public static final String DEFAULT_FILE_CONTENT = "version " + ShortcutConfigParser.PARSER_VERSION + "\n" +
             "program default\n" +
@@ -143,6 +154,10 @@ public final class ExtraKeysView extends LinearLayout {
         builtinExtraKeys.add(ARROW_DOWN);
         builtinExtraKeys.add(ARROW_LEFT);
         builtinExtraKeys.add(ARROW_RIGHT);
+        builtinExtraKeys.add(HOME);
+        builtinExtraKeys.add(END);
+        builtinExtraKeys.add(PAGE_UP);
+        builtinExtraKeys.add(PAGE_DOWN);
     }
 
     public void updateButtons() {
diff --git a/app/src/main/java/io/neoterm/view/TerminalView.java b/app/src/main/java/io/neoterm/view/TerminalView.java
index 9bb5c77..aa9f8f3 100755
--- a/app/src/main/java/io/neoterm/view/TerminalView.java
+++ b/app/src/main/java/io/neoterm/view/TerminalView.java
@@ -259,6 +259,7 @@ public final class TerminalView extends View {
 
             @Override
             public boolean commitText(CharSequence text, int newCursorPosition) {
+                // TODO: AutoComplete
                 if (LOG_KEY_EVENTS) {
                     Log.i(EmulatorDebug.LOG_TAG, "IME: commitText(\"" + text + "\", " + newCursorPosition + ")");
                 }
diff --git a/app/src/main/java/io/neoterm/view/eks/ExtraButton.java b/app/src/main/java/io/neoterm/view/eks/ExtraButton.java
index b0ca11e..274ddef 100644
--- a/app/src/main/java/io/neoterm/view/eks/ExtraButton.java
+++ b/app/src/main/java/io/neoterm/view/eks/ExtraButton.java
@@ -15,6 +15,14 @@ public abstract class ExtraButton implements View.OnClickListener {
     public static final String KEY_ESC = "Esc";
     public static final String KEY_TAB = "Tab";
     public static final String KEY_CTRL = "Ctrl";
+    public static final String KEY_PAGE_UP = "PgUp";
+    public static final String KEY_PAGE_DOWN = "PgDn";
+    public static final String KEY_HOME = "Home";
+    public static final String KEY_END = "End";
+    public static final String KEY_ARROW_UP = "▲";
+    public static final String KEY_ARROW_DOWN = "▼";
+    public static final String KEY_ARROW_LEFT = "◀";
+    public static final String KEY_ARROW_RIGHT = "▶";
 
     public String buttonText;
 
@@ -31,18 +39,30 @@ public abstract class ExtraButton implements View.OnClickListener {
             case KEY_TAB:
                 keyCode = KeyEvent.KEYCODE_TAB;
                 break;
-            case "▲":
+            case KEY_ARROW_UP:
                 keyCode = KeyEvent.KEYCODE_DPAD_UP;
                 break;
-            case "◀":
+            case KEY_ARROW_LEFT:
                 keyCode = KeyEvent.KEYCODE_DPAD_LEFT;
                 break;
-            case "▶":
+            case KEY_ARROW_RIGHT:
                 keyCode = KeyEvent.KEYCODE_DPAD_RIGHT;
                 break;
-            case "▼":
+            case KEY_ARROW_DOWN:
                 keyCode = KeyEvent.KEYCODE_DPAD_DOWN;
                 break;
+            case KEY_PAGE_UP:
+                keyCode = KeyEvent.KEYCODE_PAGE_UP;
+                break;
+            case KEY_PAGE_DOWN:
+                keyCode = KeyEvent.KEYCODE_PAGE_DOWN;
+                break;
+            case KEY_HOME:
+                keyCode = KeyEvent.KEYCODE_MOVE_HOME;
+                break;
+            case KEY_END:
+                keyCode = KeyEvent.KEYCODE_MOVE_END;
+                break;
             case "―":
                 chars = "-";
                 break;
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index f0627ff..6745743 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -14,6 +14,8 @@
     <string name="pref_general_shell_desc">登录时使用指定的 Shell</string>
     <string name="pref_general_vibrate">振动</string>
     <string name="pref_general_vibrate_desc">收到 \'\\a\' 时振动</string>
+    <string name="pref_general_program_selection">程序选择模式</string>
+    <string name="pref_general_program_selection_desc">当 NeoTerm 和 系统 中都含有同一个程序时，选择将要被执行的程序的模式</string>
     <string name="pref_package_source">软件源</string>
     <string name="pref_ui_close_tab_anim_next_tab">向下切换窗口</string>
     <string name="pref_ui_close_tab_anim_next_tab_desc">关闭当前窗口时切换到下一个窗口而不是上一个</string>
@@ -40,4 +42,10 @@
     <string name="use_system_shell">使用系统Shell</string>
     <string name="retry">重试</string>
     <string name="source_changed">APT 源已更改，你可能需要执行 apt update 来更新</string>
+
+    <string-array name="pref_general_program_selection_entries">
+        <item>只使用 NeoTerm</item>
+        <item>优先使用 NeoTerm</item>
+        <item>优先使用 System</item>
+    </string-array>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/preference_keys.xml b/app/src/main/res/values/preference_keys.xml
index 2461be9..31cb4d7 100644
--- a/app/src/main/res/values/preference_keys.xml
+++ b/app/src/main/res/values/preference_keys.xml
@@ -4,6 +4,7 @@
     <string name="key_general_vibrate" translatable="false">neoterm_general_vibrate</string>
     <string name="key_generaL_backspace_map_to_esc" translatable="false">neoterm_general_backspace_map_to_esc</string>
     <string name="key_general_shell" translatable="false">neoterm_general_shell</string>
+    <string name="key_general_program_selection" translatable="false">neoterm_general_program_selection</string>
 
     <string name="key_ui_fullscreen" translatable="false">neoterm_ui_fullscreen</string>
     <string name="key_ui_hide_toolbar" translatable="false">neoterm_ui_hide_toolbar</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index cc6c92d..d10e830 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -24,6 +24,8 @@
     <string name="pref_general_backspace_map_to_esc_desc">Send esc when backspace is pressed</string>
     <string name="pref_general_shell" translatable="false">Shell</string>
     <string name="pref_general_shell_desc">Which shell should we use when login</string>
+    <string name="pref_general_program_selection">Program Selection</string>
+    <string name="pref_general_program_selection_desc">When both Neo Term and your Android OS have a program, which one should we choose?</string>
     <string name="pref_ui_fullscreen">Full Screen</string>
     <string name="pref_ui_hide_toolbar">Hide Toolbar</string>
     <string name="pref_ui_hide_toolbar_desc">Hide toolbar when keyboard is showing</string>
@@ -56,4 +58,16 @@
         <item>fish</item>
     </string-array>
 
+    <string-array name="pref_general_program_selection_values" translatable="false">
+        <item>NeoTermOnly</item>
+        <item>NeoTermFirst</item>
+        <item>SystemFirst</item>
+    </string-array>
+
+    <string-array name="pref_general_program_selection_entries">
+        <item>NeoTerm Only</item>
+        <item>NeoTerm First</item>
+        <item>System First</item>
+    </string-array>
+
 </resources>
diff --git a/app/src/main/res/xml/setting_general.xml b/app/src/main/res/xml/setting_general.xml
index e0fce99..700fecd 100644
--- a/app/src/main/res/xml/setting_general.xml
+++ b/app/src/main/res/xml/setting_general.xml
@@ -18,6 +18,14 @@
         android:summary="@string/pref_general_backspace_map_to_esc_desc"
         android:title="@string/pref_general_backspace_map_to_esc" />
 
+    <ListPreference
+        android:defaultValue="NeoTermOnly"
+        android:key="@string/key_general_program_selection"
+        android:title="@string/pref_general_program_selection"
+        android:summary="@string/pref_general_program_selection_desc"
+        android:entries="@array/pref_general_program_selection_entries"
+        android:entryValues="@array/pref_general_program_selection_values"/>
+
     <ListPreference
         android:defaultValue="sh"
         android:entries="@array/pref_general_shell_entries"