how to open vs code from terminal in ubuntu code example

Example 1: install vscode ubuntu command line

sudo snap install --classic code

Example 2: open vs code from terminal

Launch VS Code.
Open the Command Palette (Cmd+Shift+P) and type 'shell command' to find the Shell Command: Install 'code' command in PATH command.
Restart the terminal
Navigate to project folder in terminal, 
Type code . press enter

Example 3: open visual studio code from terminal ubuntu

code /path/filename