free - Display amount of free and used memory in the system
$ free
To display free and used memory in bytes
$free -b
To display free and used memory in kilobytes
$free -k
To display free and used memory in megabytes
$free -m
To display free and used memory in gigabyte
$free -g
To display an additional line containing the total of the total, used and
free columns
$ free -t
To display the output of free command after a set time gap
$ free -s 4 -c 4
regards,
T.Dhanasekar