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# Linux free Command [ Linux Command Manual](#) The Linux free command is used to display memory status. The free command displays memory usage, including physical memory, virtual swap file memory, shared memory segments, and buffers used by the system kernel. ### Syntax free **Parameter Description**: * -b Display memory usage in Bytes. * -k Display memory usage in KB. * -m Display memory usage in MB. * -h Display memory usage in a human-readable format, with a maximum of three digits, automatically calculating the corresponding unit value. The units are: B = bytes K = kilos M = megas G = gigas T = teras * -o Do not display the buffer adjustment column. * -s Continuously observe memory usage. * -t Display the memory total 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 165788Swap: 524280 65116 459164 Display memory usage information in total form # free -t //Query memory usage information in total form total used free shared buffers cached Mem: 254772 184868 69904 0 5936 89908-/+ buffers/cache: 89024 165748Swap: 524280 65116 459164Total: 779052 249984 529068 Periodically query memory usage information # free -s 10 //Execute the command every 10s total used free shared buffers cached Mem: 254772 187628 67144 0 6140 89964-/+ buffers/cache: 91524 163248Swap: 524280 65116 459164 total used free shared buffers cached Mem: 254772 187748 67024 0 6164 89940-/+ buffers/cache: 91644 163128Swap: 524280 65116 459164 [ Linux Command Manual](#)