http://w3techs.com/technologies/details/os-linux/all/all
W3Techs checked the top ten million web servers daily from June 2013, but W3Techs's definition of "website" differs a bit from Alexa's definition; the "top 10 million" websites are actually fewer than 10 million. W3Techs claims that these difference "have no statistical significance".
http://www.w3cook.com/os/summary/
W3Cook checks the top one million web servers monthly, taken from the Alexa ranking, using HTTP headers, DNS records, and WHOIS data, among other sources.
两家的统计数据有差异，但是 Ubuntu + Debian 份额都是第一
W3Techs checked the top ten million web servers daily from June 2013, but W3Techs's definition of "website" differs a bit from Alexa's definition; the "top 10 million" websites are actually fewer than 10 million. W3Techs claims that these difference "have no statistical significance".
http://www.w3cook.com/os/summary/
W3Cook checks the top one million web servers monthly, taken from the Alexa ranking, using HTTP headers, DNS records, and WHOIS data, among other sources.
两家的统计数据有差异，但是 Ubuntu + Debian 份额都是第一
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