我今天需要一个大于ssh-key的文件，而cat还不够.您需要在EC2中启用EPEL仓库才能获取xclip:

I needed this today for a file larger than a ssh-key, and cat was not enough. You need to enable the EPEL repo in EC2 in order to get xclip:

wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
sudo rpm -ivh epel-release-latest-7.noarch.rpm
sudo yum-config-manager --enable epel
sudo yum install xclip -y