GNU/Linux Command – FREE

free — Display the memory utilization info.
 
Summary:
 
Displays the total amount of free and used physical memory and swap space in the system, as well as the buffers and cache consumed by the kernel.
 
Examples:
$ free -- Display the mem info in KB.  $ free -m -- Display the mem info in MB.  $ free -m -t -- Display the total mem info.  $ free -s 2 -- Display the mem info for every 2Sec.  $ free -s 2 -c 5 -- Display mem info for every 2Sec but only 5 times.  $ cat /proc/meminfo -- This is the original info which is used by the free command for the report.
Read: man free

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