diff --git a/gclc.system/src/main/java/net/bigeon/gclc/system/ExecSystemCommand.java b/gclc.system/src/main/java/net/bigeon/gclc/system/ExecSystemCommand.java
index b29521a..8707664 100644
--- a/gclc.system/src/main/java/net/bigeon/gclc/system/ExecSystemCommand.java
+++ b/gclc.system/src/main/java/net/bigeon/gclc/system/ExecSystemCommand.java
@@ -101,7 +101,7 @@ public class ExecSystemCommand extends Command {
         try (BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os))) {
             while (th.isAlive()) {
                 final String user = in.prompt();
-                // Avoid interruption being sent to process.
+                // Forward to process if not empty.
                 if (!user.isEmpty()) {
                     writer.write(user + EOL);
                 }
diff --git a/gclc.system/src/test/java/net/bigeon/gclc/system/ExecSystemCommandTest.java b/gclc.system/src/test/java/net/bigeon/gclc/system/ExecSystemCommandTest.java
index 11538f2..9488d11 100644
--- a/gclc.system/src/test/java/net/bigeon/gclc/system/ExecSystemCommandTest.java
+++ b/gclc.system/src/test/java/net/bigeon/gclc/system/ExecSystemCommandTest.java
@@ -79,4 +79,26 @@ public class ExecSystemCommandTest {
         }
     }
 
+    /** Test the execution of the command.
+     * 
+     * @throws CommandRunException if the command fails */
+    @Test
+    public void testLongExecute() throws CommandRunException {
+        final ConsoleOutput out = SinkOutput.INSTANCE;
+        final ConsoleInput in = EmptyInput.INSTANCE;
+
+        final ExecSystemCommand cmd = new ExecSystemCommand();
+        if (System.getProperty("os.name").contains("indows")) {
+            cmd.execute(out, in, "cmd", "/C", "dir", "/s");
+        } else if (System.getProperty("os.name").contains("inux")) {
+            cmd.execute(out, in, "ls", "-R");
+        }
+        try {
+            cmd.execute(out, in, "inexistent");
+            fail("Able to execute inexistent command in system");
+        } catch (final CommandRunException e) {
+            // ok
+        }
+    }
+
 }