how see text on linux code example

Example 1: linux command to view file

cat command.
less command.
more command.
"gnome-open command" or "xdg-open command" (generic version) or "kde-open command" (kde version) – Linux gnome/kde desktop command to open any file.
open command – OS X specific command to open any file.

Example 2: open a file in linux

cat <filename>