'view' is the command for the vi text editor in read-only mode (aka: vi -R). When you type 'view hidden', the vi text editor will open a text file named 'hidden' for you to view.
Type 'man view' or 'man vi' to read the manual for the vi text editor for more info.
If you want to use a text editor in Terminal, may I suggest using 'pico' rather than 'vi'. I find it's more user-friendly for the newbie.