Displays system memory utilization you might use the free command.

By execute the free command, you may get the details on the free memory. These are the sample and step to run the free command.

[root@localhost ~]# free
[root@localhost ~]# free -b,-k,-m,-g    /show output in bytes, KB, MB, or GB/
[root@localhost ~]# free -l    /show detailed low and high memory statistics/
[root@localhost ~]# free -0   /use old format (no -/+buffers/cache line)/
[root@localhost ~]# free -t   /display total for RAM + swap/
[root@localhost ~]# free -s  /update every [delay] seconds/
[root@localhost ~]# free -c  /update [count] times/
[root@localhost ~]# free -v  /display version information and exit/

Free

Output :

You may use the other free command to watch memory utilization every two seconds, use this command:

watch free or

watch –n 1–d free

output :

[Ctrl]-[C] to cancel the command runs.