# free - [Command Function](#section175151514841) - [Syntax](#section8488721749) - [Parameters](#section27272181949) - [Usage](#section148661259410) - [Example](#section68081530242) - [Output](#section171235517543) ## Command Function This command is used to display the system memory usage and the sizes of the **text**, **data**, **rodata**, and **bss** segments. ## Syntax free \[_-k | -m_\] ## Parameters **Table 1** Parameter description

Parameter	Description	Value Range
No parameter	Displays the size in bytes.	N/A
-k	Displays the size in KiB.	N/A
-m	Displays the size in MiB.	N/A

## Usage None ## Example Run **free**, **free -k**, and **free -m**, respectively. ## Output **Figure 1** Displaying the memory usage in three units ![](figure/displaying-the-memory-usage-in-three-units.png "displaying-the-memory-usage-in-three-units") **Table 2** Output

Output	Description
total	Total size of the dynamic memory pool
used	Size of the used memory
free	Size of the unallocated memory
heap	Size of the allocated heap
text	Size of a code segment
data	Size of a data segment
rodata	Size of a read-only data segment
bss	Size of the memory occupied by uninitialized global variables