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review what i studied `date` - 2017-4-20

yum install createrepo
createrepo Packages-directory
#自己制作yum源repo文件

sed -i ‘s/^/#/g‘ filename
#所有的行加上#号
Crrl+V 选中开头Shift+I输入#号
#vi模式下

yum install bash-completion
#Centos 7 补全功能


review what i studied `date` - 2017-4-20