Introduction: If you are using a system and would like to determine its physical memory without physically checking, you can use the command line. This is also useful for scripting purposes, when a system or set of systems have indeterminate memory capacities. Requirements: A system with access to the command line. Procedure: Windows Open the command line Type the following command: systeminfo Somewhere in the output, you should see a line similar to the following: Total Physical Memory: 3,990 MB This is the total physical memory on the system. Linux Open the command line Type the following command: grep MemTotal /proc/meminfo You should see something similar to the following as output: MemTotal: 4194304 kB This is your total available memory.