Usage:
 free [options]

Options:
-b, --bytes show output in bytes --kilo show output in kilobytes --mega show output in megabytes --giga show output in gigabytes --tera show output in terabytes --peta show output in petabytes
-k, --kibi show output in kibibytes
-m, --mebi show output in mebibytes
-g, --gibi show output in gibibytes --tebi show output in tebibytes --pebi show output in pebibytes
-h, --human show human-readable output --si use powers of 1000 not 1024
-l, --lohi show detailed low and high memory statistics
-t, --total show total for RAM + swap
-s N, --seconds N repeat printing every N seconds
-c N, --count N repeat printing N times, then exit
-w, --wide wide output --help display this help and exit
-V, --version output version information and exit
For more details see free(1).