Command to get memory usage
By default, Virtualmin will get total and free memory from the appropriate
commands for your operating system. However, if these are not accurate or
do not reflect the usage you want users to see (such as in a VPS environment),
this field can be set to a command that must output the following values, one
per line :
- Total real memory in bytes
- Free real memory in bytes
- Total swap space in bytes, or 0 if none
- Free swap space in bytes