“Yes/No” in Bash Script – Prompt for Confirmation

---

Very often in bash scrips you need to ask for user input that requires a Yes or No answer.

For example, you may want to put a quick “Are you sure?” prompt for confirmation before execution of some potentially dangerous part of a bash script.

In this article you’ll find three easiest and fastest ways to prompt for “Yes/No” confirmation in bash script.

Prompt To Continue In Bash

The best way to prompt for a confirmation to continue in a bash script is to use the read command (source):

read -p "Are you sure? " -n 1 -r
echo    # (optional) move to a new line
if [[ ! $REPLY =~ ^[Yy]$ ]]
then
    exit 1
fi

Simple “Yes/No” Dialog In Bash

One of the most widely used method to ask user for a confirmation in a bash script is to combine read + case commands (source):

while true; do
    read -p "Do you wish to install this program?" yn
    case $yn in
        [Yy]* ) make install; break;;
        [Nn]* ) exit;;
        * ) echo "Please answer yes or no.";;
    esac
done

Select From “Yes/No” Menu In Bash

Another easy method is to use select command (source):

echo "Do you wish to install this program?"
select yn in "Yes" "No"
case $yn in
    Yes ) make install;;
    No ) exit;;
esac

---

Article Number: 483
Posted: Mon, Feb 18, 2019 2:34 PM
Last Updated: Mon, Feb 18, 2019 2:34 PM

Online URL: http://kb.ictbanking.net/article.php?id=483