Created
September 2, 2018 23:41
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Yes / No Function for bash
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| #!/bin/bash | |
| # This is a general-purpose function to ask Yes/No questions in Bash, either | |
| # with or without a default answer. It keeps repeating the question until it | |
| # gets a valid answer. | |
| ask() { | |
| local prompt default reply | |
| while true; do | |
| if [ "${2:-}" = "Y" ]; then | |
| prompt="Y/n" | |
| default=Y | |
| elif [ "${2:-}" = "N" ]; then | |
| prompt="y/N" | |
| default=N | |
| else | |
| prompt="y/n" | |
| default= | |
| fi | |
| # Ask the question (not using "read -p" as it uses stderr not stdout) | |
| echo -n "$1 [$prompt] " | |
| # Read the answer (use /dev/tty in case stdin is redirected from somewhere else) | |
| read reply </dev/tty | |
| # Default? | |
| if [ -z "$reply" ]; then | |
| reply=$default | |
| fi | |
| # Check if the reply is valid | |
| case "$reply" in | |
| Y*|y*) return 0 ;; | |
| N*|n*) return 1 ;; | |
| esac | |
| done | |
| } | |
| # Default to Yes if the user presses enter without giving an answer: | |
| if ask "Do you want to configure this setting?" Y; then | |
| echo "Yes" | |
| else | |
| echo "No" | |
| fi |
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