1.ctrl alt t open terminal
2.cat /etc/redhat-release
3.yun update
4.reboot
5.su su- difference whether switching work environment
6.rqm -qa
-a option to query all installed packages.
-q query a package is installed
(Show the difference: rpm packages already installed will not show the suffix .rpm, without the suffix .rpm installation package display)
General inquiries a package is installed command:
For example: rpm -qa | grep kernel
7.uname -a Show all system messages