Crontab use nano

// nano
export VISUAL=nano; crontab -e

// vim
export VISUAL=vim; crontab -e

Source: garron.me

Open crontab in nano

EDITOR=nano crontab -e. This will use nano only for that execution. 
alias crontab='EDITOR=nano /usr/bin/crontab' This will work on your current session

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