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memory size

The virsh command can be used to mange local or remote guest operating systems. The program can be used to create, pause, and shutdown domains. It can also be used to list current domains.
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OpenBSD: Find Out Memory RAM Size Information

How do I check for installed RAM (memory) size on a OpenBSD UNIX operating systems using command line?
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HowTo: Find Out Hard Disk Specs / Details on Linux

Can you tell me a Linux command to find out information about my hard disk such as description, product name, bus type, size, and cache memory size under Linux operating systems using command line options?
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Q. How do I find out the memory size of my AIX UNIX server? Can you tell us the command name to do the same?

A. You need to use bootinfo command to determines and displays various boot information, including boot device type and boot device name.

Command to check RAM in AIX UNIX

The bootinfo command uses the device configuration databases in information searches.

Just type the following command as the root user:
bootinfo -r

It will displays amount of real memory in kilobytes. bootinfo command may not be available in latest AIX UNIX version, try following command:
$ lsattr -El sys0 | grep realmem

svmon command - Captures and analyzes a snapshot of virtual memory

The svmon command displays information about the current state of memory. The displayed information does not constitute a true snapshot of memory, because the svmon command runs at user level with interrupts enabled. To print out global statistics, type:
# svmon -G

Read the man page of svmon for more information.

Linux Check Memory Usage

How do I check used and free RAM memory usage under Linux operating systems using command line and GUI tools?
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