how to open a file in terminal mac code example

Example 1: how to open a file using terminal

open ~/Desktop/filename.txt

Example 2: open a file in from terminal

cat <path/your_file>

Example 3: open a file mac terminal

To use default application:
$ open ~/Desktop/filename.mp4

To use a specific application:
$ open -a "QuickTime Player" ~/Desktop/filename.mp4