shell 监控域名到期时间

#!/bin/bash
# by Rohin
# site：blog.982013.xyz
####################################
#检测是否存在whois命令，不存在则安装jwhois包
which whois &>/dev/null || yum install -y jwhois
# 设置要检查的域名
DOMAINS=("baidu.com" "xiaohongshu.com" "jd.com")
for DOMAIN in "${DOMAINS[@]}";do
  DOMAIN_INFO=$(whois $DOMAIN)
  EXPIRY_DATE=$(echo "$DOMAIN_INFO" | grep -iE "Expiration|Expiry|renewal" | head -n 1)
  if [[ $EXPIRY_DATE =~ [0-9]{4}-[0-9]{2}-[0-9]{2}T ]]; then
      FORMATTED_DATE=$(echo $EXPIRY_DATE | sed -E 's/.*([0-9]{4}-[0-9]{2}-[0-9]{2})T.*/\1/')
  elif [[ $EXPIRY_DATE =~ [0-9]{4}-[0-9]{2}-[0-9]{2} ]]; then
      FORMATTED_DATE=$(echo $EXPIRY_DATE | sed -E 's/.*([0-9]{4}-[0-9]{2}-[0-9]{2}).*/\1/')
  else
      FORMATTED_DATE=$EXPIRY_DATE
  fi

  CURRENT_DATE=$(date -u +%Y-%m-%d)

  if [[ -z "$FORMATTED_DATE" ]]; then
    printf "没有获取到域名: %-10s 的过期时间，请检查网络及输入的域名是否正确。\n" "$DOMAIN"
  elif [[ "$CURRENT_DATE" > "$FORMATTED_DATE" ]]; then
    printf "域名: %-20s 已经过期，请注意！\n" "$DOMAIN"
  else
    printf "域名: %-20s %s\n" "$DOMAIN" "将在 $FORMATTED_DATE 过期。"
  fi
done