id - To check uid and gid of user, uptime - To check system uptime, hostnamectl - To check and set hostname, timedatectl - To check and set system time and date, free - To check memory information, lsblk - To check hard disk information, uname - to check kernel name, echo - To print on screen, lscpu - To check cpu information, init 0 - To poweroff system, init 6 - To restart system,

Basic commands

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