confirm function in shell

confirm.sh

# Asks the user a yes/no question and waits for a response. Takes the question
# text as its only argument. The user must enter either "y" or "n" to proceed.
confirm()
{
  while true; do
    read -r -p "$1" RESPONSE
    case "$RESPONSE" in
      [yY]) return 0 ;;
      [nN]) return 1 ;;
      *) echo "Please enter y or n"
    esac
  done
}

 confirm "Install the xorg-x11-drv-void package? [y/n]: " && \
          yum install xorg-x11-drv-void
          
confirm "Are you sure? [y/n]: " || exit 0

# 判断文件是否存在
if [ ! -f "$XORG_MODULE_DIR/input/void_drv.so" ] &&
     [ ! -f "$XORG_MODULE_DIR64/input/void_drv.so" ]; then
    echo "WARNING: Xorg void input driver not found."

# 判断是否是root
if [ -z "$IS_ROOT" ]; then
        echo "Re-run as root to install Xorg void input driver package."