diff --git a/Linux/basic_cmd.md b/Linux/basic_cmd.md
index 041bbbe..5d34f85 100644
--- a/Linux/basic_cmd.md
+++ b/Linux/basic_cmd.md
@@ -1,6 +1,44 @@
 # Basic Linux Command
 
+Searching the PATH for executable files matching the names of the arguments
+> $ which ls
 
-> which ls
+Interactive processes viewer
+> $ htop
+
+# APT
+> $ apt install
+> $ apt remove
+> $ apt autoremove
+> $ apt update
 
 
+## Display & Destop Manager
+
+* Architecture:
+> BIOS -> GRUB -> Display Manager -> Desktop Environement
+
+* Install Desktop Environement (GUI)
+
+> $ tasksel
+> $ apt install gnome
+> $ apt remove gnome
+
+* Reconfigurer le display manager
+> $ sudo dpkg-reconfigure gdm3
+
+* Installer le display manager
+
+> $ sudo apt install lightdm
+
+> $ sudo apt install gdm3
+
+* remove Desktop environement
+
+> $ sudo apt remove lightdm 
+
+# Services 
+- HTOP
+- dhclient > get ip
+- gnome networkmanager 
+- wpa_supplicant > encryption @ wifi