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FREE(1) 				  User Commands 				  FREE(1)

NAME
       free - Display amount of free and used memory in the system

SYNOPSIS
       free [options]

DESCRIPTION
       free displays the total amount of free and used physical and swap memory in the system, as
       well as the buffers and caches used by the kernel. The information is gathered by  parsing
       /proc/meminfo. The displayed 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)

       buffers
	      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)

OPTIONS
       -b, --bytes
	      Display the amount of memory in bytes.

       -k, --kilo
	      Display the amount of memory in kilobytes.  This is the default.

       -m, --mega
	      Display the amount of memory in megabytes.

       -g, --giga
	      Display the amount of memory in gigabytes.

       --tera Display the amount of memory in terabytes.

       -h, --human
	      Show  all  output fields automatically scaled to shortest three digit unit and dis-
	      play the units of print out.  Following units are used.

		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  ter-
	      abytes and columns might not be aligned with header.

       -c, --count count
	      Display the result count times.  Requires the -s option.

       -l, --lohi
	      Show detailed low and high memory statistics.

       -o, --old
	      Display  the  output in old format, the only difference being this option will dis-
	      able 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.

       -t, --total
	      Display a line showing the column totals.

       --help Print help.

       -V, --version
	      Display version information.

FILES
       /proc/meminfo
	      memory information

SEE ALSO
       ps(1), slabtop(1), top(1), vmstat(8).

AUTHORS
       Written by Brian Edmonds.

REPORTING BUGS
       Please send bug reports to <procps@freelists.org>

procps-ng				  September 2011				  FREE(1)
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