How to make nano the default editor on the system

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Add to /etc/environment FILE (for root)
or/and FOR USER to ~/.bash_profile

export EDITOR="/usr/bin/nano"
export VISUAL=$EDITOR

For edit /etc/sudoers with nano you need once edit sudoers config:

sudo -i
export EDITOR=nano
visudo

add at end of file:

## Set nano as default editor
Defaults env_reset
Defaults editor=/usr/bin/nano, !env_editor

Save changes in files.

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