刚刚才注意，默许情形下rhel6 是不安装screen命令的：
[root@rhel63single yum.repos.d]# yum install screen Loaded plugins: product-id, refresh-packagekit, security, subscription-manager Updating certificate-based repositories. Unable to read consumer identity rhel-source | 4.0 kB 00:00 ... rhel-source-beta | 4.0 kB 00:00 ... Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package screen.x86_64 0:4.0.3-16.el6 will be installed --> Finished Dependency Resolution Dependencies Resolved ============================================================================================================================================================ Package Arch Version Repository Size ============================================================================================================================================================ Installing: screen x86_64 4.0.3-16.el6 rhel-source 494 k Transaction Summary ============================================================================================================================================================ Install 1 Package(s) Total download size: 494 k Installed size: 795 k Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : screen-4.0.3-16.el6.x86_64 1/1 Installed products updated. Verifying : screen-4.0.3-16.el6.x86_64 1/1 Installed: screen.x86_64 0:4.0.3-16.el6 Complete! [root@rhel63single yum.repos.d]# which screen /usr/bin/screen [root@rhel63single yum.repos.d]# [root@rhel63single
