Linux free Command

Linux Command Manual

The Linux free command is used to display memory status.

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

Syntax

free [-bkmotV][-s &lt;interval seconds>]

Parameter Description:

-b Display memory usage in bytes.
-k Display memory usage in kilobytes.
-m Display memory usage in megabytes.
-h Display memory usage in a suitable unit, up to three digits, automatically calculating the corresponding unit value. Units include:
```
B = bytes
K = kilos
M = megas
G = gigas
T = teras
```
-o Do not show the buffer adjustment column.
-s<interval seconds> Continuously observe memory usage.
-t Display the total memory column.
-V Display version information.

Examples

Display memory usage

# free //Display memory usage information
total used free shared buffers cached
Mem: 254772 184568 70204 0 5692 89892
-/+ buffers/cache: 88984 165788
Swap: 524280 65116 459164

Display memory usage in total

# free -t //Query memory usage information in total
total used free shared buffers cached
Mem: 254772 184868 69904 0 5936 89908
-/+ buffers/cache: 89024 165748
Swap: 524280 65116 459164
Total: 779052 249984 529068

Periodically query memory usage information

# free -s 10 //Execute the command every 10 seconds
total used free shared buffers cached
Mem: 254772 187628 67144 0 6140 89964
-/+ buffers/cache: 91524 163248
Swap: 524280 65116 459164

total used free shared buffers cached
Mem: 254772 187748 67024 0 6164 89940
-/+ buffers/cache: 91644 163128
Swap: 524280 65116 459164

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