diff --git a/kernel/src/arch/riscv32/io.rs b/kernel/src/arch/riscv32/io.rs
index f6d35bf..aa9129d 100644
--- a/kernel/src/arch/riscv32/io.rs
+++ b/kernel/src/arch/riscv32/io.rs
@@ -6,14 +6,24 @@ struct SerialPort;
 impl Write for SerialPort {
     fn write_str(&mut self, s: &str) -> Result {
         for c in s.bytes() {
-            sbi::console_putchar(c as usize);
+            if c == 8 {
+                sbi::console_putchar(8);
+                sbi::console_putchar(' ' as usize);
+                sbi::console_putchar(8);
+            } else {
+                sbi::console_putchar(c as usize);
+            }
         }
         Ok(())
     }
 }
 
 pub fn getchar() -> char {
-    sbi::console_getchar() as u8 as char
+    match sbi::console_getchar() as u8 {
+        255 => 0,   // null
+        127 => 8,   // back
+        c => c,
+    } as char
 }
 
 pub fn putfmt(fmt: Arguments) {
diff --git a/kernel/src/arch/x86_64/interrupt/handler.rs b/kernel/src/arch/x86_64/interrupt/handler.rs
index 7ae856b..ee02605 100644
--- a/kernel/src/arch/x86_64/interrupt/handler.rs
+++ b/kernel/src/arch/x86_64/interrupt/handler.rs
@@ -131,13 +131,12 @@ fn keyboard() {
 
 fn com1() {
     use arch::driver::serial::*;
-    info!("\nInterupt: COM1");
-    COM1.lock().receive();
+    trace!("\nInterupt: COM1");
 }
 
 fn com2() {
     use arch::driver::serial::*;
-    info!("\nInterupt: COM2");
+    trace!("\nInterupt: COM2");
     COM2.lock().receive();
 }
 
diff --git a/kernel/src/console.rs b/kernel/src/console.rs
new file mode 100644
index 0000000..284e3b0
--- /dev/null
+++ b/kernel/src/console.rs
@@ -0,0 +1,64 @@
+use core::ops::Deref;
+
+pub struct LineBuf {
+    buf: [u8; BUF_SIZE],
+    len: usize,
+}
+
+pub struct LineBufGuard<'a>(&'a str);
+
+const BUF_SIZE: usize = 256;
+
+impl LineBuf {
+    pub const fn new() -> Self {
+        LineBuf {
+            buf: [0; BUF_SIZE],
+            len: 0,
+        }
+    }
+
+    /// Put a char received from serial. Return str if get a line.
+    pub fn push_u8<'a>(&'a mut self, c: u8) -> Option<LineBufGuard<'a>> {
+        use alloc::str;
+        match c {
+            b' '...128 if self.len != BUF_SIZE => {
+                self.buf[self.len] = c;
+                self.len += 1;
+            }
+            8 /* '\b' */ if self.len != 0 => {
+                self.len -= 1;
+            }
+            b'\n' | b'\r' => {
+                let s = str::from_utf8(&self.buf[..self.len]).unwrap();
+                self.len = 0;
+                return Some(LineBufGuard(s));
+            }
+            _ => {}
+        }
+        None
+    }
+}
+
+impl<'a> Deref for LineBufGuard<'a> {
+    type Target = str;
+    fn deref(&self) -> &str {
+        self.0
+    }
+}
+
+use alloc::string::String;
+use arch::io::getchar;
+
+pub fn get_line() -> String {
+    let mut buf = LineBuf::new();
+    loop {
+        let mut c = 0;
+        while c == 0 {
+            c = getchar() as u8;
+        }
+        print!("{}", c as char);
+        if let Some(line) = buf.push_u8(c) {
+            return String::from(&*line);
+        }
+    }
+}
\ No newline at end of file
diff --git a/kernel/src/fs.rs b/kernel/src/fs.rs
index 361d308..dd652f2 100644
--- a/kernel/src/fs.rs
+++ b/kernel/src/fs.rs
@@ -5,7 +5,7 @@ use arch::driver::ide;
 use spin::Mutex;
 use process;
 
-pub fn load_sfs() {
+pub fn shell() {
     #[cfg(target_arch = "riscv")]
     let device = {
         extern {
@@ -19,17 +19,23 @@ pub fn load_sfs() {
     let sfs = SimpleFileSystem::open(device).unwrap();
     let root = sfs.root_inode();
     let files = root.borrow().list().unwrap();
-    trace!("Loading programs: {:?}", files);
+    println!("Available programs: {:?}", files);
 
-//    for name in files.iter().filter(|&f| f != "." && f != "..") {
-    for name in files.iter().filter(|&f| f == "hello") {
-        static mut BUF: [u8; 64 << 12] = [0; 64 << 12];
-        let file = root.borrow().lookup(name.as_str()).unwrap();
-        let len = file.borrow().read_at(0, unsafe { &mut BUF }).unwrap();
-        process::add_user_process(name, unsafe { &BUF[..len] });
+    let mut buf = Box::new([0; 64 << 12]);
+    loop {
+        use console::get_line;
+        let name = get_line();
+        if name == "" {
+            continue;
+        }
+        if let Ok(file) = root.borrow().lookup(name.as_str()) {
+            println!("Running: {}", name);
+            let len = file.borrow().read_at(0, &mut *buf).unwrap();
+            process::add_user_process(name, &buf[..len]);
+        } else {
+            println!("Program not exist");
+        }
     }
-
-    process::print();
 }
 
 struct MemBuf(&'static [u8]);
diff --git a/kernel/src/lib.rs b/kernel/src/lib.rs
index d48eb1a..3a132a3 100644
--- a/kernel/src/lib.rs
+++ b/kernel/src/lib.rs
@@ -66,6 +66,7 @@ mod fs;
 mod thread;
 mod sync;
 mod trap;
+mod console;
 
 #[allow(dead_code)]
 #[cfg(target_arch = "x86_64")]
@@ -85,9 +86,10 @@ pub extern "C" fn rust_main() -> ! {
     logging::init();
     arch::init();
     process::init();
-    fs::load_sfs();
     unsafe { arch::interrupt::enable(); }
 
+    fs::shell();
+
 //    thread::test::local_key();
 //    thread::test::unpack();
 //    sync::test::philosopher_using_mutex();