diff --git a/src/builtin-exec/builtin.c b/src/builtin-exec/builtin.c
new file mode 100644
index 0000000..48914ae
--- /dev/null
+++ b/src/builtin-exec/builtin.c
@@ -0,0 +1,84 @@
+#include <sys/wait.h>
+#include <limits.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include "../cmd/cmd.h"
+#include <unistd.h>
+#include "../env/env.h"
+#include "../utils/utils.h"
+#include "../../lib/bozolib/bozolib.h"
+#include "../exec/exec.h"
+
+char* builtin_path(const char* executable)
+{
+  if (strcmp(executable, "cd") == 0 || strcmp(executable, "where") == 0); 
+  else
+    return NULL;
+  return strdup(executable);
+}
+
+int change_directory(char** args, lst** env)
+{
+  char cwd[PATH_MAX];
+  char* oldpwd = get_env_variable(env, "PWD"); 
+  if(len((void**)args)==1)
+  {
+    char* path = get_env_variable(env, "HOME");
+    chdir(path);
+  }
+  else if (len((void**)args)>2)
+  {
+  dprintf(2, "cd : Trop d'arguments!\n");
+    return 1;
+  }
+  else if (chdir(args[1]) != 0)
+  {
+    dprintf(2, "Mauvais chemin : %s\n", args[1]);
+    return 1;
+  }  
+  edit_env_variable(env, "OLDPWD", oldpwd); 
+  if (getcwd(cwd, sizeof(cwd)) != NULL)
+    edit_env_variable(env, "PWD", cwd);
+  return 0;
+}
+
+int where(char** args, lst** env)
+{
+  if (len((void**)args)==1)
+  {
+    dprintf(2, "where : Il faut au moins 1 argument!\n");
+    return 1;
+  }
+  char* exec;
+  for (int i=1; args[i]!=NULL; i++)
+  {
+    exec = get_executable_path(args[i], env); 
+    if (exec == NULL)
+      printf("commande inconnue : %s\n", args[i]);
+    else if (builtin_path(exec) != NULL)
+      printf("%s : shell built-in command\n", exec);
+    else  
+      printf("%s\n", exec);
+    free(exec);
+  }
+  return 0;
+}
+
+int builtin_execute(cmd* input, lst** env)
+{
+  if (strcmp(input->executable, "cd") == 0)
+  {
+    change_directory(input->args, env);
+    return 0;
+  }
+  else if(strcmp(input->executable, "where") == 0)
+  {
+    where(input->args, env);
+    return 0;
+  }
+  else
+  {
+    return 1;
+  }
+}
diff --git a/src/builtin-exec/builtin.h b/src/builtin-exec/builtin.h
new file mode 100644
index 0000000..e5f15c6
--- /dev/null
+++ b/src/builtin-exec/builtin.h
@@ -0,0 +1,9 @@
+#pragma once
+
+#include "../cmd/cmd.h"
+#include "../../lib/bozolib/bozolib.h"
+
+char* builtin_path(const char* executable);
+int change_directory(char** args, lst** env);
+int where(char** args);
+int builtin_execute(cmd* input, lst** env);
diff --git a/src/exec/exec.c b/src/exec/exec.c
index 3c6fc8a..a2209f9 100644
--- a/src/exec/exec.c
+++ b/src/exec/exec.c
@@ -8,6 +8,7 @@
 #include "../env/env.h"
 #include "../utils/utils.h"
 #include "../../lib/bozolib/bozolib.h"
+#include "../builtin-exec/builtin.h"
 
 int len(void** list)
 {
@@ -16,52 +17,6 @@ int len(void** list)
   return index;
 }
 
-char* builtin_path(const char* executable)
-{
-  if (strcmp(executable, "cd") == 0);
-  else
-    return NULL;
-  return strdup(executable);
-}
-
-int change_directory(char** args, lst** env)
-{
-  char cwd[PATH_MAX];
-  char* oldpwd = get_env_variable(env, "PWD"); 
-  if(len((void**)args)==1)
-  {
-    char* path = get_env_variable(env, "HOME");
-    chdir(path);
-  }
-  else if (len((void**)args)>2)
-  {
-  dprintf(2, "cd : Trop d'arguments!\n");
-    return 1;
-  }
-  else if (chdir(args[1]) != 0)
-  {
-    dprintf(2, "Mauvais chemin : %s\n", args[1]);
-    return 1;
-  }  
-  edit_env_variable(env, "OLDPWD", oldpwd); 
-  if (getcwd(cwd, sizeof(cwd)) != NULL)
-    edit_env_variable(env, "PWD", cwd);
-  return 0;
-}
-
-int builtin_execute(cmd* input, lst** env)
-{
-  if (strcmp(input->executable, "cd") == 0)
-  {
-    change_directory(input->args, env);
-    return 0;
-  }
-  else
-  {
-    return 1;
-  }
-}
-
 int execute(cmd* input, lst** env)
 {
   int pid;
@@ -94,6 +49,35 @@ int execute(cmd* input, lst** env)
   return exitcode;
 }
 
+char* get_executable_path(const char* executable, lst** env)
+{
+  char* builtin = builtin_path(executable);
+  if (builtin != NULL)
+    return builtin;
+  int size_path_str;
+  char * path_file;
+  char* path_env = get_env_variable(env, "PATH");
+  char** path_env_splited =split_quoted_charset(path_env, ":");
+  
+  for (int i=0; path_env_splited[i] != NULL; i++)
+  {
+    size_path_str = strlen(path_env_splited[i])+strlen(executable)+1; 
+    path_file = malloc((size_path_str+1)*sizeof(char));
+    strcpy(path_file, path_env_splited[i]);
+    strcat(path_file, "/");
+    strcat(path_file, executable);
+    if (access(path_file, X_OK) == 0)
+    {
+      tab_free((void**)path_env_splited);
+      return path_file;
+    }
+      
+    free(path_file);
+  }
+  tab_free((void**)path_env_splited);
+  return NULL;
+}
+
 int cmds_list_exec(lst** cmds, lst** env)
 {
 	lst* current = *cmds;
@@ -117,32 +101,3 @@ int cmds_list_exec(lst** cmds, lst** env)
 	}
 	return 0;
 }
-
-char* get_executable_path(const char* executable, lst** env)
-{
-  char* builtin = builtin_path(executable);
-  if (builtin != NULL)
-    return builtin;
-  int size_path_str;
-  char * path_file;
-  char* path_env = get_env_variable(env, "PATH");
-  char** path_env_splited =split_quoted_charset(path_env, ":");
-  
-  for (int i=0; path_env_splited[i] != NULL; i++)
-  {
-    size_path_str = strlen(path_env_splited[i])+strlen(executable); 
-    path_file = malloc((size_path_str+1)*sizeof(char));
-    strcpy(path_file, path_env_splited[i]);
-    strcat(path_file, "/");
-    strcat(path_file, executable);
-    if (access(path_file, X_OK) == 0)
-    {
-      tab_free((void**)path_env_splited);
-      return path_file;
-    }
-      
-    free(path_file);
-  }
-  tab_free((void**)path_env_splited);
-  return NULL;
-}
diff --git a/src/exec/exec.h b/src/exec/exec.h
index 2773607..6df14b1 100644
--- a/src/exec/exec.h
+++ b/src/exec/exec.h
@@ -6,4 +6,5 @@
 int cmds_list_exec(lst** cmds, lst** env);
 int execute(cmd* input, lst** env);
 int builtin_execute(cmd* input, lst** env);
+int len(void** list);
 char* get_executable_path(const char* executable, lst** env);