diff --git a/nanos-lite/src/loader.c b/nanos-lite/src/loader.c
index 3e64dc17..7ad2e65 100644
--- a/nanos-lite/src/loader.c
+++ b/nanos-lite/src/loader.c
@@ -47,3 +47,7 @@ void naive_uload(PCB *pcb, const char *filename) {
   ((void(*)())entry) ();
 }
 
+int _execve(const char *fname, char *const argv[], char *const envp[]) {
+  naive_uload(NULL, fname);
+  return -1;
+}
diff --git a/nanos-lite/src/syscall.c b/nanos-lite/src/syscall.c
index f5b6bba..4a6608c 100644
--- a/nanos-lite/src/syscall.c
+++ b/nanos-lite/src/syscall.c
@@ -15,6 +15,8 @@ int _gettimeofday(struct timeval *tv, struct timezone *tz) {
   return 0;
 }
 
+int _execve(const char *fname, char *const argv[], char *const envp[]);
+
 #define CASE(syscall, ...) case _SYSCALL_NAME(syscall): __VA_ARGS__; break;
 void do_syscall(Context *c) {
   uintptr_t a[4];
@@ -34,9 +36,9 @@ void do_syscall(Context *c) {
     CASE(close, c->GPRx = fs_close((int)a[1]))
     
     CASE(gettimeofday, c->GPRx = _gettimeofday((struct timeval*)a[1], (struct timezone*)a[2]))
-    
+    CASE(execve, c->GPRx = _execve((const char*)a[1], (char* const*)a[2], (char* const*)a[3]))
     CASE(brk, c->GPRx = _brk((void*)a[1]))
-    CASE(exit, halt(0))
+    CASE(exit, _execve("/bin/menu", NULL, NULL))
     default: panic("Unhandled syscall ID = %d", a[0]);
   }
 }
diff --git a/navy-apps/Makefile b/navy-apps/Makefile
index 3826cf4..7871880 100644
--- a/navy-apps/Makefile
+++ b/navy-apps/Makefile
@@ -166,7 +166,7 @@ $(CLEAN_ALL):
 .PHONY: clean-all $(CLEAN_ALL)
 
 ### Build fsimg and ramdisk for Nanos-lite
-APPS = nslider menu
+APPS = nslider menu nterm
 TESTS = dummy hello file-test timer-test event-test bmp-test
 
 fsimg: $(addprefix apps/, $(APPS)) $(addprefix tests/, $(TESTS))
diff --git a/navy-apps/apps/nterm/src/builtin-sh.cpp b/navy-apps/apps/nterm/src/builtin-sh.cpp
index 5703c20..f81d27e 100644
--- a/navy-apps/apps/nterm/src/builtin-sh.cpp
+++ b/navy-apps/apps/nterm/src/builtin-sh.cpp
@@ -22,7 +22,88 @@ static void sh_prompt() {
   sh_printf("sh> ");
 }
 
-static void sh_handle_cmd(const char *cmd) {
+static bool p_help(char *name);
+
+static int cmd_help(char *args) {
+  /* extract the first argument */
+  char *arg = strtok(NULL, " ");
+
+  if (p_help(arg) == false) {
+    sh_printf("Unknown command '%s'\n", arg);
+  }
+  return 0;
+}
+
+static int cmd_ls(char *args) {
+  sh_printf("ls\n");
+  return 0;
+}
+
+static int cmd_echo(char *args) {
+  sh_printf("%s", args);
+  return 0;
+}
+
+static int cmd_exit(char *args) {
+  exit(0);
+}
+
+static struct {
+  const char *name;
+  const char *description;
+  int (*handler) (char *);
+} cmd_table [] = {
+  { "help", "Display information about all supported commands", cmd_help },
+  // { "ls", "List all files in current directory", cmd_ls },
+  { "echo", "Print the arguments", cmd_echo },
+  { "exit", "Exit the built-in shell"}
+  /* TODO: Add more commands */
+};
+#define ARRLEN(arr) (sizeof(arr) / sizeof(arr[0]))
+#define NR_CMD ARRLEN(cmd_table)
+
+static bool p_help(char *name) {
+  for (int i = 0; i < NR_CMD; i ++) {
+    if (name == NULL) {
+      printf("%s - %s\n", cmd_table[i].name, cmd_table[i].description);
+      continue;
+    }
+    if (strcmp(name, cmd_table[i].name) == 0) {
+      printf("%s - %s\n", cmd_table[i].name, cmd_table[i].description);
+      return true;
+    }
+  }
+  return true ? name == NULL : false;
+}
+
+static void sh_handle_cmd(const char *_cmd) {
+  char str[128];
+  strcpy(str, _cmd);
+  char *str_end = str + strlen(str);
+
+  /* extract the first token as the command */
+  char *cmd = strtok(str, " ");
+  if (cmd == NULL) { return; }
+  int cmd_len = strlen(cmd);
+  if (cmd[cmd_len - 1] == '\n') cmd[--cmd_len] = '\0';
+
+  /* treat the remaining string as the arguments,
+   * which may need further parsing
+   */
+  char *args = cmd + cmd_len + 1;
+  if (args >= str_end) {
+    args = NULL;
+  }
+
+  int i;
+  for (i = 0; i < NR_CMD; i ++) {
+    if (strcmp(cmd, cmd_table[i].name) == 0) {
+      if (cmd_table[i].handler(args) < 0) { return; }
+      break;
+    }
+  }
+
+  if (i == NR_CMD) { sh_printf("Unknown command '%s'\n", cmd); }
 }
 
 void builtin_sh_run() {
diff --git a/navy-apps/apps/nterm/src/main.cpp b/navy-apps/apps/nterm/src/main.cpp
index 2d58349..3386c38 100644
--- a/navy-apps/apps/nterm/src/main.cpp
+++ b/navy-apps/apps/nterm/src/main.cpp
@@ -30,7 +30,7 @@ int main(int argc, char *argv[]) {
 
 static void draw_ch(int x, int y, char ch, uint32_t fg, uint32_t bg) {
   SDL_Surface *s = BDF_CreateSurface(font, ch, fg, bg);
-  SDL_Rect dstrect = { .x = x, .y = y };
+  SDL_Rect dstrect = { .x = (int16_t)x, .y = (int16_t)y };
   SDL_BlitSurface(s, NULL, screen, &dstrect);
   SDL_FreeSurface(s);
 }
diff --git a/navy-apps/libs/libminiSDL/src/event.c b/navy-apps/libs/libminiSDL/src/event.c
index 55721c0..d4c3fa9 100644
--- a/navy-apps/libs/libminiSDL/src/event.c
+++ b/navy-apps/libs/libminiSDL/src/event.c
@@ -9,34 +9,48 @@ static const char *keyname[] = {
   _KEYS(keyname)
 };
 
-int SDL_PushEvent(SDL_Event *ev) {
-  return 0;
-}
-
-int SDL_PollEvent(SDL_Event *ev) {
-  return 0;
-}
-
-int SDL_WaitEvent(SDL_Event *event) {
-  char buf[64];
-  while (NDL_PollEvent(buf, sizeof(buf)) == 0);
-  // printf("SDL_WaitEvent Recv %s", buf);
+static int _phase_event(SDL_Event *event, char *buf) {
+  // printf("SDL_Event Recv %s", buf);
   if (buf[0] == 'k') {
     if (buf[1] == 'd') {
       event->type = SDL_KEYDOWN;
     } else if (buf[1] == 'u') {
       event->type = SDL_KEYUP;
     }
-    for (int i = 0; i < 83; i ++ ) {
-      if (strncmp(buf + 3, keyname[i], strlen(buf) - 4) == 0) {
-        // printf("SDL_WaitEvent Got %s\n", keyname[i]);
+    int buflen = strlen(buf) - 4;
+    for (int i = 0; i < sizeof(keyname)/sizeof(keyname[0]); i ++ ) {
+      if (keyname[i][buflen] != '\0') continue;
+      if (strncmp(buf + 3, keyname[i], buflen) == 0) {
+        // printf("SDL_Event Got %s\n", keyname[i]);
         event->key.keysym.sym = i;
         return 1;
       }
     }
     event->key.keysym.sym = SDLK_NONE;
-    // printf("SDL_WaitEvent Unknown %s\n", buf + 3);
+    // printf("SDL_Event Unknown %s\n", buf + 3);
   }
+}
+
+int SDL_PushEvent(SDL_Event *ev) {
+  return 0;
+}
+
+int SDL_PollEvent(SDL_Event *ev) {
+  char buf[64];
+  if (NDL_PollEvent(buf, sizeof(buf)) == 0) {
+    return 0;
+  }
+  _phase_event(ev, buf);
+  return 1;
+}
+
+int SDL_WaitEvent(SDL_Event *event) {
+  char buf[64];
+  while (NDL_PollEvent(buf, sizeof(buf)) == 0);
+  // printf("SDL_WaitEvent Recv %s", buf);
+  _phase_event(event, buf);
+
+  // error return 0
   return 1;
 }
 
diff --git a/navy-apps/libs/libminiSDL/src/general.c b/navy-apps/libs/libminiSDL/src/general.c
index d1884d6..7971910 100644
--- a/navy-apps/libs/libminiSDL/src/general.c
+++ b/navy-apps/libs/libminiSDL/src/general.c
@@ -1,6 +1,8 @@
 #include <NDL.h>
 
+uint32_t SDL_start_time;
 int SDL_Init(uint32_t flags) {
+  SDL_start_time = NDL_GetTicks();
   return NDL_Init(flags);
 }
 
diff --git a/navy-apps/libs/libminiSDL/src/timer.c b/navy-apps/libs/libminiSDL/src/timer.c
index ebe3782..ef8cdac 100644
--- a/navy-apps/libs/libminiSDL/src/timer.c
+++ b/navy-apps/libs/libminiSDL/src/timer.c
@@ -10,8 +10,9 @@ int SDL_RemoveTimer(SDL_TimerID id) {
   return 1;
 }
 
+extern uint32_t SDL_start_time;
 uint32_t SDL_GetTicks() {
-  return 0;
+  return NDL_GetTicks() - SDL_start_time;
 }
 
 void SDL_Delay(uint32_t ms) {
diff --git a/navy-apps/libs/libos/src/syscall.c b/navy-apps/libs/libos/src/syscall.c
index bf2739a..b631fde 100644
--- a/navy-apps/libs/libos/src/syscall.c
+++ b/navy-apps/libs/libos/src/syscall.c
@@ -98,8 +98,7 @@ int _gettimeofday(struct timeval *tv, struct timezone *tz) {
 }
 
 int _execve(const char *fname, char * const argv[], char *const envp[]) {
-  _exit(SYS_execve);
-  return 0;
+  return _syscall_(SYS_execve, (intptr_t)fname, (intptr_t)argv, (intptr_t)envp);
 }
 
 // Syscalls below are not used in Nanos-lite.