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In linux, you can use the free command to query the server's memory, which can be used to display memory usage, including physical memory, virtual swap file memory, shared memory segments, and buffers used by the system core. The syntax is "free [- bkmotV] [- s]".

The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

How to query server memory by linux

The Linux free command is used to display memory status.

The free instruction shows memory usage, including physical memory, virtual swap file memory, shared memory segments, and buffers used by the system core.

Grammar

Free [- bkmotV] [- s]

Parameter description:

-b displays memory usage in Byte units.

-k displays memory usage in KB units.

-m displays memory usage in MB units.

-h displays memory usage in appropriate units, up to a maximum of three digits, and automatically calculates the corresponding unit value. The units are:

B = bytes

K = kilos

M = megas

G = gigas

T = teras

-o the buffer adjustment column is not displayed.

-s continuously observe memory usage.

-t displays the memory sum column.

-V displays version information.

Example

Display memory usage

The free command defaults to the display unit kb, which can be viewed with the free-m and free-g commands, representing MB and GB, respectively.

In addition, free-h will automatically choose to display in units of capacity that are suitable for understanding.

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