Check Memory Usage in Linux - Linux Basics

Commands to Check RAM/Memory usage in Linux

free               shows usage in KiloBytes

root@arm:~# free
                   total        used           free     shared    buffers     cached
Mem:         50204      45392       4812          0       5740        20464
-/+ buffers/cache:      19188      31016
Swap:            0          0          0

free -b               shows usage in Bytes

free -k               shows usage in KiloBytes

free -m              shows usage in MegaBytes

free -g               shows usage in GigaBytes