diff --git a/01_phase_rust_src/sv/src/executor.rs b/01_phase_rust_src/sv/src/executor.rs
index 8fc94ad..7c738f8 100644
--- a/01_phase_rust_src/sv/src/executor.rs
+++ b/01_phase_rust_src/sv/src/executor.rs
@@ -1,14 +1,19 @@
 
 
 use std::fs;
+use std::path::Path;
+use std::env::set_current_dir;
 
 pub fn execute(svdir_var: String, svwait_var: i32, verbose: i8, command: &str, services: Vec<String>){
+    // TODO: Return the exec code.
     println!("execute in exec");
     dbg!(svdir_var.clone());
     dbg!(svwait_var);
     dbg!(verbose);
     dbg!(command);
 
+    let mut exit_code: i32 = 0;
+
     for sv in services {
         let ch1 = sv.chars().next().unwrap();
         let ch2_row = &sv.chars().collect::<Vec<_>>()[..2];
@@ -18,15 +23,29 @@ pub fn execute(svdir_var: String, svwait_var: i32, verbose: i8, command: &str, s
         if ch1 == '/' || ch2 == "~/"{
             // case absolute path for the service
             //
-            path = sv;
+            path = sv.clone();
         } else {
             // case relative path for the service.
             //
             path = svdir_var.clone() + "/" + &sv;
         }
-        dbg!(path);
-            // 1. Check if path exists.
-            //
+
+        // 1. Check if path exists.
+        //
+        let path_to_sv = Path::new(&path);
+
+        if set_current_dir(path_to_sv).is_ok() {
+            println!("Set path okay.");
+            // TODO: make a function which do what's next.
+            // It will be called, sent_signal, will return 0 if no error, and 1 if an error.
+        } else {
+            println!("fail: {}: unable to change to service directory: file does not exist", sv);
+            if exit_code < 99 {
+                exit_code += 1;
+            }
+        }
+
+        // TODO
             // 2. Check if supervise/ok exist
             //
             // if not, error => increase by one the exit code and print a beatifull message in Err