SYSTEM INFORMATION
# Display Linux system information
uname -a
# Display kernel release information
uname -r
# Show which version of redhat installed
cat /etc/redhat-release
# Show how long the system has been running + load
uptime
# Show system host name
hostname
# Display the IP addresses of the host
hostname -I
# Show system reboot history
last reboot
# Show the current date and time
date
# Show this month's calendar
cal
# Display who is online
w
# Who you are logged in as
whoami
thanks very helpful linux tips and tricks