Update README.md

README.md

@@ -15,6 +15,23 @@ hostname
 sudo apt update && sudo apt upgrade -y && sudo apt autoremove -y
 ```
 
+
+## ls
+
+ List  information  about the FILEs (the current directory by default).  Sort entries alphabetically if none of -cftuvSUX nor --sort is specified.
+
+
+ ```bash
+ #order by date 
+ ls -t
+
+#order by date reverse
+ls -r
+
+ ```
+
+source: man
+
 ## Users
 
 ```bash