Using vi to edit a file in terminal [duplicate]

vi = too hard to use for a new user
nano = text editor that is run from the terminal like vi, only it's much easier to use for 2 reasons:

1. The instructions for using nano editor are always found at the bottom of every page.
2. The only two nano keyboard shortcuts that you need to know are for WriteOut and Exit. Press the keyboard combination Ctrl+O and after that press Enter to save the file being edited. Press the keyboard combination Ctrl+X to exit nano.

nano is installed by default in Ubuntu.
Tip - Make the terminal easier to read. In the terminal select Edit -> Profile Preferences -> Colors tab and change the Background color to black and the Text color to white.

vi or vim is an advanced editor. So I will suggest you to get familiar with it before using it.

For now:

• If you want to edit a file using terminal, press i to go into insert mode.

• Edit your file and press ESC and then :w to save changes and :q to quit.

However, you can combine these two like :wq to write and quit the vim editor.

You can also use gksu gedit /etc/icinga/objects/localhost.cfg to open it in gedit and work from there, if you are having trouble using vi.

But G_P is right, type man vi in the terminal and it should give you all the instructions.