Only one Pipe accepted now.

hw7/task2/src/lib.rs

@@ -135,6 +135,14 @@ impl<R: BufRead, W: Write> Shell<R, W> {
                 let commands = cmd.split('|');
                 let commands_vec: Vec<&str> = commands.collect();
 
+                if commands_vec.len() > 2 {
+                    let _ = self.writer.write_all(
+                        format!("Error: Only one pipe supported at the moment.\n")
+                            .as_bytes(),
+                    );
+                    return Err(ErrorType::BrokenPipeError);
+                }
+
                 let needs_pipe = commands_vec.len() == 2;