FREE(1) General Commands Manual FREE(1) (NAME) free - (SYNOPSIS) free [option ...] (DESCRIPTION) free (swap) (caches) . /proc/meminfo . : total (MemTotal SwapTotal /proc/meminfo). . used ( total - available) free (MemFree SwapFree /proc/meminfo) shared () tmpfs (Shmem /proc/meminfo) buffers (Buffers /proc/meminfo) cache (page cache) slab (Cached SReclaimable /proc/meminfo) buff/cache buffers cache available (swapping) . cache free slab (MemAvailable /proc/meminfo 3.14 2.6.27+ free) (OPTIONS) -b, --bytes . -k, --kibi . . -m, --mebi . -g, --gibi . --tebi . --pebi . --kilo . --si . --mega . --si . --giga . --si . --tera . --si . --peta . --si . -h, --human . . B = bytes Ki = kibibyte Mi = mebibyte Gi = gibibyte Ti = tebibyte Pi = pebibyte . -w, --wide (wide mode). . buffers cache . -c, --count count count . -s . -l, --lohi (low) (high). -L, --line -s . -s, --seconds delay delay . delay (.) (,) . usleep(3) . --si ( ) ( ). -t, --total . -v, --committed /. total . (memory overcommit) . free . . . --help . -V, --version . (FILES) /proc/meminfo (BUGS) shared 2.6.32 . . (SEE ALSO) ps(1), slabtop(1), top(1), vmstat(8). procps-ng 2023-05-02 FREE(1)