how to open folder in finder by terminal code example

Example 1: open folder from terminal

Just use "open [path_to_dir]" in Unix or "start [path_to_dir]" in Windows as:
open .	#Open current directdory in Unix
start . #Open current directory in Windows

Example 2: how to open a folder using terminal

nautilus /home/karthick/Music
xdg-open /home/karthick/Music