diff --git a/goblin.go b/goblin.go
index f56249b..48c6fe4 100644
--- a/goblin.go
+++ b/goblin.go
@@ -14,6 +14,7 @@ import(
 	"github.com/jienfak/goblin/ls"
 	"github.com/jienfak/goblin/yes"
 	"github.com/jienfak/goblin/date"
+	"github.com/jienfak/goblin/uniq"
 )
 
 func main() {
@@ -34,6 +35,7 @@ func main() {
 		"ls" : ls.Run,
 		"yes" : yes.Run,
 		"date" : date.Run,
+		"uniq" : uniq.Run,
 	}
 
 	if binBase := path.Base(os.Args[0]) ; binBase != "goblin" {
diff --git a/uniq/uniq.go b/uniq/uniq.go
new file mode 100644
index 0000000..89b8b47
--- /dev/null
+++ b/uniq/uniq.go
@@ -0,0 +1,45 @@
+/* Yes program implementation. */
+package uniq
+
+import(
+	"os"
+	"fmt"
+	"flag"
+	"bufio"
+	"io"
+)
+
+func Run(args []string) int {
+	var(
+		Uflag bool
+	)
+	status := 0
+	arg0 := args[0]
+	args = args[1:]
+	flagSet := flag.NewFlagSet(arg0, flag.ExitOnError)
+	flagSet.BoolVar(&Uflag, "U", false, "Print every line just one time.")
+	flagSet.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage of %s: %s [options] [string]\n", arg0, arg0)
+		flagSet.PrintDefaults()
+	}
+	flagSet.Parse(args)
+	args = flagSet.Args()
+
+	r := bufio.NewReader(os.Stdin)
+	u := make(map[string]int)
+	if Uflag {
+		for{
+			l, e := r.ReadString('\n')	
+			if e==io.EOF {
+				break
+			}
+			_, haskey := u[l]
+			if !haskey {
+				u[l] = 1
+				fmt.Print(l)
+			}
+		}
+	}
+
+	return status
+}