free command displays amount of total, free and used physical memory (RAM) in the system, as well as shoing information on shared memory, buffers, cached memory and swap space used by the Linux kernel.
Syntax of free
free -[options]
Example usage of free
free -m
The command will display information about physical memory in MB.
free -m -s 5
The command will activate continuous polling delay at 5 seconds apart, and then display memory status in megabytes on terminal. Any floating point number for delay can be specified.
free -t -m
Same with “free -m”, but -t switch will display a line containing the totals of physical memory and swap space.
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