diff --git a/src/elements/command/simple.rs b/src/elements/command/simple.rs
index 3de7e0d3..c1edbfe3 100644
--- a/src/elements/command/simple.rs
+++ b/src/elements/command/simple.rs
@@ -30,9 +30,13 @@ pub struct SimpleCommand {
 
 impl Command for SimpleCommand {
     fn exec(&mut self, core: &mut ShellCore, pipe: &mut Pipe) -> Option<Pid> {
-        self.args = self.words.iter()
-                    .filter(|w| w.text != "")
-                    .map(|w| w.text.clone()).collect();
+        for w in self.words.iter_mut() {
+            let mut ws = w.eval().iter()
+                         .filter(|e| e.text.len() != 0)
+                         .map(|e| e.text.clone())
+                         .collect::<Vec<String>>();
+            self.args.append(&mut ws);
+        }
 
         if self.args.len() == 0 {
             return None;