#Linux Commands In Structured Order ##1. SYSTEM
$ uname –a => Display linux system information
$ uname –r => Display kernel release information (refer uname command in detail)
$ cat /etc/redhat_release => Show which version of redhat installed
$ uptime => Show how long system running + load (learn uptime command)
$ hostname => Show system host name
$ hostname -i => Display the IP address of the host (all options hostname)
$ last reboot => Show system reboot history (more examples last command)