Many times you have seen commands ask for confirmation [Y/n] or [Yes/No] input. This is very useful part to know if a user wants to proceed with remaining steps for not. You can also add the same function to your script. This article will help you with examples of (Bash Script – Prompt to Confirm (Y/N, YES/NO)) this type of inputs.
#1 Prompt for Confirmation (Once)
This example code will prompt for confirming once if you give wrong input, the program will exit with status 1. This example will accept only Y or N or YES or NO (Not case-sensitive).
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#!/bin/bash read -r -p "Are You Sure? [Y/n] " input case $input in [yY][eE][sS]|[yY]) echo "Yes" ;; [nN][oO]|[nN]) echo "No" ;; *) echo "Invalid input..." exit 1 ;; esac |
#2 Prompt for Confirmation (in Loop)
This example code will prompt for confirmation until you give proper input like (Y, N, YES or NO). If you give wrong input, it will again prompt for correct input and repeat the same steps. This example will accept only Y or N or YES or NO (Not case-sensitive).
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#!/bin/bash while true do read -r -p "Are You Sure? [Y/n] " input case $input in [yY][eE][sS]|[yY]) echo "Yes" ;; [nN][oO]|[nN]) echo "No" ;; *) echo "Invalid input..." ;; esac done |
Thanks for your page, but there is a bug here –
This – is incorrect. You need to drop the semicolon at the end of the line ‘while true;’
while true:
do
This is correct –
while true
do
Thanks Jeff,
The article has been updated.