Update index.md (#19698)

guide/english/terminal-commandline/windows-command-prompt/index.md

@@ -48,8 +48,10 @@ rm /s name_of_directory_you_want_to_delete
 
 ## Useful tips:
 -	The command `Ipconfig` shows your computer's ip address 
+- The command `getmac` shows your computer's physical address
 -	If you type part of a directory's name and hit the `tab` key the command prompt will autocomplete it and if you hit the `tab` key repeatedly it will cycle through directories that start with the same letter 
 -	You can use other shells or tools such as git bash or cmder to add more commands and functionality to your command prompt 
 - Some tasks require you to run the command prompt as an administrator you clicking the windows button and typing `cmd admin` and hit the `enter` key
 - If you know the path to a file or directory can type `cd PATH_TO_YOUR_DIRECTORY` instead of changing directories several times to get to a directory or file 
-- When you hit the up arrow key your previously entered command will appear and if you hit it repeatedly it will cycle through all of your previously entered commands 
+- Use `cd ..` to move to the previous parent directory
+- When you hit the up arrow key your previously entered command will appear and if you hit it repeatedly it will cycle through all of your previously entered commands