Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Mail Systems
Eclipse Documentation

How To Guides
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Problem Solutions
Privacy Policy




Red Hat Enterprise Linux 9 Essentials Book now available.

Purchase a copy of Red Hat Enterprise Linux 9 (RHEL 9) Essentials

Red Hat Enterprise Linux 9 Essentials Print and eBook (PDF) editions contain 34 chapters and 298 pages

Preview Book

20.2. Memory Usage

The free command displays the total amount of physical memory and swap space for the system as well as the amount of memory that is used, free, shared, in kernel buffers, and cached.
             total       used       free     shared    buffers     cached
Mem:       4017660    1619044    2398616          0      59864     637968
-/+ buffers/cache:     921212    3096448
Swap:      3071996          0    3071996
The command free -m shows the same information in megabytes, which are easier to read.
             total       used       free     shared    buffers     cached
Mem:          3923       1569       2353          0         58        626
-/+ buffers/cache:        884       3038
Swap:         2999          0       2999
If you prefer a graphical interface for free, you can use the GNOME System Monitor. To start it from the desktop, select ApplicationsSystem ToolsSystem Monitor or execute gnome-system-monitor at a shell prompt. Click on the Resources tab.
GNOME System Monitor - Resources tab
Resources tab of the gnome-system-monitor
Figure 20.2.  GNOME System Monitor - Resources tab

  Published under the terms of the Creative Commons License Design by Interspire