Linux Command To Find the System Configuration And Hardware Information

On Linux based system most of the hardware information can be extracted from /proc file system, for example display CPU and Memory information, enter:

cat /proc/meminfo
cat /proc/cpuinfo

Linux cpu/hardware information

Use any one of the following command:
# less /proc/cpuinfo

OR
# lscpu

Linux show free and used memory in the system

Use any one of the following command:
# cat /proc/meminfo

OR
# free
# free -m
# free -mt
# free -gt

Linux find out the current running kernel version

Type the following command:
# cat /proc/version

OR use the following command:
# uname -mrs
# uname -a

Find out information about the Linux distribution and version
$ cat /etc/*release*

List all PCI devices

# lspci

List all USB devices

# lsusb

List all block devices (hard disks, cdrom, and others)

# lsblk

Display installed hard disk and size

# fdisk -l | grep '^Disk /dev/'

Dump all hardware information

Type the following command to see your motherboard, cpu, vendor, serial-numbers, RAM, disks, and other information directly from the system BIOS:

# dmidecode | less