Exit/save edit to sudoers file? Putty SSH

Question

Been following instructions for editing sudoers file, made changes but the instructions say to exit using ctrl+x - this just gives me a capital X and a caret. Have tried ctrl:x ctrl+Q Esc.

Not using nano or any other gui (just putty terminal), the change I am trying to save is to set nano as default editor.

I just need to know which keys do I press and in which order?

Also as a side question are there any 'good' linux tutorial sites, I seem to trawl for hours trying to find the simplest answers? 'Good' as in explained well and without omitting vital info (like which gui you are using).

Answer 1

To make changes to sudo from putty/bash:

• Type visudo and press enter.
• Navigate to the place you wish to edit using the up and down arrow keys.
• Press insert to go into editing mode.
• Make your changes - for example: user ALL=(ALL) ALL.
• Note - it matters whether you use tabs or spaces when making changes.
• Once your changes are done press esc to exit editing mode.
• Now type :wq to save and press enter.
• You should now be back at bash.
• Now you can press ctrl + D to exit the session if you wish.

Answer 2

Just open file by nano /file_name

Once done, press CTRL+O and then Enter to save. Then press CTRL+X to return.

Here CTRL+O : is CTRL and O for Orange Not 0 Zero