Linux simple maintenance command

[root@localhost ]# dmesg -->system error output

[root@localhost ]# cat /var/log/message -->system message output

[root@localhost ]# df -h -->list filesystems details

[root@localhost ]# top -->realtime system statistics

[root@localhost ]# uname -a -->check system details

[root@localhost ]# ifconfig -a  -->check communication interface details

[root@localhost ]# init 0 -->command for shutdown now

[root@localhost ]# init 6 --> command for restart now