diff --git a/src/main.rs b/src/main.rs
index 7f4c9cc..1c299bf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -37,6 +37,7 @@
 #![allow(unsafe_code)]
 #![allow(unused_variables)]
 #![allow(dead_code)]
+
 use std::fs::File;
 use std::fs::OpenOptions;
 use std::path::Path;
@@ -756,6 +757,77 @@ impl Market {
         }
     }
 
+fn process_file(fname: &str) {
+    println!("Processing file: {}",fname)
+    }
+
+
+fn interactive(m: &mut Market) {
+    println!("Trading interactively in Tuesday Markets (demo)");
+    let stdin = io::stdin();
+    let mut trader:usize=0;
+    for line in stdin.lock().lines() {
+        match line {
+            Ok(input) => {
+                let tokens: Vec<&str> = input.split_whitespace().collect();
+                match tokens.as_slice() {
+                    ["dump"] => m.dump(),
+                    ["login", username] =>
+                        if let Some(t)=m.trader_name2num.get_mut(*username) { trader=*t; println!("Logged in as {}",m.traders[trader].name) } else { println!("Trader {} not found.",username) },
+                    ["whoami" ] => { println!("Logged in as {}, id {}",m.traders[trader].name,trader ); }
+                    ["addtrader", username] => { let id=m.register_trader(username); println!("Added user {} as id {}",username,id); },
+                    ["balances"] => {
+                        println!("Balances for trader {}",m.traders[trader].name);
+                        for (key,value) in &m.traders[trader].balances { println!("    {} {}",m.number_to_name(*key),value); }
+                        }
+                    ["addasset", assetname] => {
+                        if let Some(cur)=m.register_asset(assetname) { println!("Added asset {} ",m.number_to_name(cur)) }
+                        else { println!("Asset {} already exists.",assetname) }
+                        }
+                    ["addfunds", username, qty0, cur0 ] => {
+                        let id=m.trader_name2num.get(*username);
+                        let qty=FiNum::new_str(qty0);
+                        let cur=m.name_to_number(cur0);
+                        if id.is_none() { println!("Could not find trader {}",username); }
+                        else if qty.is_zero() { println!("Could not parse quantity {}",qty0) }
+                        else if cur.is_none() { println!("Could not find asset {}",cur0) }
+                        else {
+                            let id=*id.unwrap();
+                            let cur=*cur.unwrap();
+                            m.add_trader_balance(id,cur,qty);
+                            println!("Added {} {} to {}",qty,m.number_to_asset(cur).name,m.traders[id].name)
+                            }
+                        }
+                    ["order", qty0, cur0, qty1, cur1 ] => {
+                        let qty0=FiNum::new_str(qty0);
+                        let cur0=m.name_to_number(cur0);
+                        let qty1=FiNum::new_str(qty1);
+                        let cur1=m.name_to_number(cur1);
+                        if !qty0.is_zero() && cur0.is_some() && !qty1.is_zero() && cur1.is_some() {
+                            m.make_order(trader,*cur0.unwrap(),*cur1.unwrap(),qty0,qty1);
+                            }
+                        }
+                    ["quit"] => {
+                        break;
+                    }
+                    _ => println!("Invalid command. Please try again."),
+                }
+            }
+            Err(error) => println!("Error reading input: {}", error),
+        }
+    }
+}
+
+fn erase(filename: &str) {
+    // Stub function for erasing a file
+    println!("Erasing file: {}", filename);
+}
+
+fn copy(source: &str, destination: &str) {
+    // Stub function for copying a file
+    println!("Copying file from {} to {}", source, destination);
+}
+
 
 fn tokens_to_command(m: &Market, logged_in: usize, tokens: Vec<&str>) -> Command {
     let cmd:Command=match &tokens[..] {