Attempt to run a process if command isn't a builtin

src/main.rs

@@ -1,6 +1,6 @@
 use std::{
     io::{self, Write},
-    path::{Component, Path, PathBuf},
+    path::{Component, Path, PathBuf}, process::Command,
 };
 
 use clap::Parser;
@@ -157,7 +157,21 @@ fn main() {
                 println!("exit");
                 println!("help");
             }
-            _ => println!("psh: {}: command not found", cmd[0]),
+            _ => {
+                let path = if cmd[0].starts_with(".") || cmd[0].starts_with("~") || cmd[0].starts_with("/")  {
+                    cmd[0].to_string()
+                } else {
+                    format!("/bin/{}", cmd[0])
+                };
+                let mut proc = match Command::new(path).spawn() {
+                    Ok(x) => x,
+                    Err(e) => {
+                        println!("psh: {}: {}", cmd[0], e);
+                        continue;
+                    }
+                };
+                let _ = proc.wait().unwrap();
+            }
         }
     }
 }