Linux free memory

Ever find yourself on another Linux system wondering why is this system so slow !

I wonder what RAM is installed I hear you thinking, the answer is the ‘free’ command.

# free

This will show you the amount of free and used memory installed in your machine with the option to use the following switches:

-b this will display the output in bytes

-k again in kilobytes

-m megabytes

-g gigabytes

-h in human readable form

-t will give you column totals

-s <variable> will repeat the command every <var> seconds