Red Hat CentOS -bash: whois: command not found

新裝的機器突然要用  whois 查一下自己的 Domain 才發現 !! 疑!!~ 怎麼沒內建 whois Orz!

# whois domain

-bash: whois: command not found

# yum -y install jwhois

相關資料:
http://blog.51osos.com/linux/centos-install-whois-command/