Checking the RAM

How to check the amount of RAM in your machine:

$ free -mt
total used free shared buffers cached
Mem: 16054 2959 13095 0 27 2617
-/+ buffers/cache: 315 15739
Swap: 7820 0 7820
Total: 23875 2959 20915

$ cat /proc/meminfo
MemTotal: 16440088 kB
MemFree: 13409252 kB
Buffers: 27648 kB
Cached: 2680276 kB
SwapCached: 0 kB
Active: 2844436 kB
Inactive: 118344 kB
SwapTotal: 8008360 kB
SwapFree: 8008360 kB
Dirty: 20 kB
Writeback: 0 kB
AnonPages: 254868 kB
Mapped: 32136 kB
Slab: 42140 kB
SReclaimable: 21872 kB
SUnreclaim: 20268 kB
PageTables: 2532 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 16228404 kB
Committed_AS: 1417776 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 266304 kB
VmallocChunk: 34359471791 kB

$ dmidecode --type 17
(NOTE: use sudo if you are login as non-root user with privilege)

$ prtconf |grep Mem

Other useful command:
$ cat /proc/cpuinfo

Source:
http://www.cyberciti.biz/tips/how-much-ram-does-my-linux-system.html
https://www.linuxquestions.org/questions/debian-26/check-my-ammount-of-ram-248050/
http://www.cyberciti.biz/faq/check-ram-speed-linux/
http://ubuntuforums.org/showthread.php?t=457883