FREE(1) User Commands FREE(1)NAMEfree - Display amount of free and used memory in the system
DESCRIPTIONfree displays the total amount of free and used physical and swap mem‐
ory in the system, as well as the buffers and caches used by the ker‐
nel. The information is gathered by parsing /proc/meminfo. The dis‐
played columns are:
total Total installed memory (MemTotal and SwapTotal in /proc/meminfo)
used Used memory (calculated as total - free)
free Unused memory (MemFree and SwapFree in /proc/meminfo)
shared Memory used (mostly) by tmpfs (Shmem in /proc/meminfo, available
on kernels 2.6.32, displayed as zero if not available)
Memory used by kernel buffers (Buffers in /proc/meminfo)
cached Memory used by the page cache (calculated as Cached - Shmem in
/proc/meminfo - the Cached value is actually the sum of page
cache and tmpfs memory)
Display the amount of memory in bytes.
Display the amount of memory in kilobytes. This is the default.
Display the amount of memory in megabytes.
Display the amount of memory in gigabytes.
--tera Display the amount of memory in terabytes.
Show all output fields automatically scaled to shortest three
digit unit and display the units of print out. Following units
B = bytes
K = kilos
M = megas
G = gigas
T = teras
If unit is missing, and you have petabyte of RAM or swap, the
number is in terabytes and columns might not be aligned with
-c, --count count
Display the result count times. Requires the -s option.
Show detailed low and high memory statistics.
Display the output in old format, the only difference being this
option will disable the display of the "buffer adjusted" line.
-s, --seconds seconds
Continuously display the result delay seconds apart. You may
actually specify any floating point number for delay, usleep(3)
is used for microsecond resolution delay times.
--si Use power of 1000 not 1024.
Display a line showing the column totals.
--help Print help.
Display version information.
SEE ALSOps(1), slabtop(1), top(1), vmstat(8).
Written by Brian Edmonds.
Please send bug reports to ⟨firstname.lastname@example.org⟩
procps-ng September 2011 FREE(1)