10 ‘free’ Commands to Check Memory Usage in Linux

10 free Commands

10 free Commands to Check Memory Usage in Linux

Linux is one of the most popular open source operating system and comes with huge set of commands. The most important and single way of determining the total available space of the physical memory and swap memory is by using “free” command.

The Linux “free” command gives information about total used and available space of physical memory and swap memory with buffers used by kernel in Linux/Unix like operating systems.

This article provides some useful examples of “free” commands with options, that might be useful for you to better utilize memory that you have.

1. Display System Memory

Free command used to check the used and available space of physical memory and swap memory in KB. See the command in action below.

2. Display Memory in Bytes

Free command with option -b, display the size of memory in Bytes.

3. Display Memory in Kilo Bytes

Free command with option -k, display the size of memory in (KBKilobytes.

4. Display Memory in Megabytes

To see the size of the memory in (MBMegabytes use option as -m.

5. Display Memory in Gigabytes

Using -g option with free command, would display the size of the memory in GB(Gigabytes).

6. Display Total Line

Free command with -t option, will list the total line at the end.

7. Disable Display of Buffer Adjusted Line

By default the free command display “buffer adjusted” line, to disable this line use option as -o.

8. Display Memory Status for Regular Intervals

The -s option with number, used to update free command at regular intervals. For example, the below command will update free command every 5 seconds.

9. Show Low and High Memory Statistics

The -l switch displays detailed high and low memory size statistics.

10. Check Free Version

The -V option, display free command version information.

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