Check memory usage ubuntu

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.

# free total used free shared buffers cached Mem: 1021628 912548 109080 0 120368 655548 -/+ buffers/cache: 136632 884996 Swap: 4194296 0 4194296

2.

Display Memory in Bytes

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

# free -b total used free shared buffers cached Mem: 104614

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