System Configuration

• hostname: displays the name of the computer

  hostname

  It will show the current name of the machine.

  To change the hostname, please type hostnamectl set-hostname <new_name>, and for additional configuration, the file is located at /etc/hostname.

• dmidecode: gives information about the hardware and detects if it is a virtual machine

  dmidecode

  The information includes manufacturer, model, serial number, asset tags, CPU sockets, PCI slots, DIMM slots, and other I/O port info detected by the BIOS.

• uname: displays system information about the Linux environment

  uname -v

  It will show you the version of the Linux kernel you are running.

  If you want to know the hardware platform, such as x86_64 or 32-bits, please run uname -i. If you need more details about the software, please run uname -a.

• free: check the used and available space of physical memory and swap memory

  free -g

  It will display the size of the memory in GB (Gigabytes).

  If you want to display the total line of the memory resource used, please run free -t or do cat /proc/meminfo.

• lscpu: shows CPU architecture information

  lscpu

  It will show the vendor of the CPU, as well as the GHz, cores per socket, etc.

  You can view the information of your system CPU by viewing the content of the /proc/cpuinfo.

• top: shows statistical data related to the performance of a system and is updated every 5 seconds

  top

  It will display a real-time view of the performance data of all running processes in a system.

  To sort by the use of CPU, type P, or if you want to sort by the use of memory, please type M, and u to view processes owned by a specific user. Press q to quit.

• iostat: lists CPU utilization, device utilization, and network file system utilization considered since the last reboot

  iostat -C

  It will display to columns: NAME and Comments in the /tmp/data_tab.txt file.

  It will break the CPU utilization into user processes, system processes, I/O wait, and idle time.

• uptime: gives you the time for which the system has been up (or running)

  uptime

  It will display the current time, how long the system has been running, users currently logged on, and the system load averages for the past 1, 5, and 15 minutes.