You aren’t going to get a sample or anything with this command.
However, free will give you information on free, total and swap memory.
Using the -t flag shows the total memory used.
The default for free is in bytes, but the -h flag can put it in
human-readable format.
$ free -th
total used free shared buff/cache available
Mem: 15G 310M 4.3G 25M 11G 14G
Swap: 15G 0B 15G
Total: 31G 310M 20G