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https://www.enteroa.com/2015/08/04/yum%ec%9d%84-%ec%9d%b4%ec%9a%a9%ed%95%9c-proftpd-%ec%84%a4%ec%b9%98-%eb%b0%8f-%ec%84%a4%ec%a0%95-centos6/
yum을 이용한 proftpd 설치 및 설정 (centos6)