You have to enter a command in the Linux shell called “Concatenate” to find out the memory usage by Linux.
Syntax: cat/proc/meminfo.
When you will enter this command then you will see a list of memory usage like Total Memory, Free Memory, Cache memory, and many other memory usages by Linux. Other commands used in Linux are:
$ free –m // this is the simplest command where it will show the memory usage in MB.
$ vmstat –s //this command gives a report on virtual memory statistics
top // this command checks the usage of memory and cpu usage
htop // similar like top command
