1.檢查是否存在某個軟體包
rpm -q -a | grep libevent
2.列出該軟體包所有清單
rpm -ql libevent
3.删除該軟體包所有依賴
rpm -e --nodeps [package name]
4.查找是否安裝該軟體
rpm -q nginx
5.安裝指令
yum install -y ntp
rpm -q -a | grep libevent
rpm -ql libevent
rpm -e --nodeps [package name]
rpm -q nginx
yum install -y ntp