os system

Check ubuntu version

$ cat /etc/os-release

Check shell

$ echo $SHELL

Change shell to bash

$ chsh -s /bin/bash

Check IP address

$ hostname -I

CPU cores

$ lscpu

GPU info

$ nvidia-smi

Memory info

$ free -h

Disk partition usage

$ df -h

Shutdown system

$ sudo halt

Restart system

$ sudo reboot