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You can use any one of the following command line tools to view the ram size under Red hat Enterprise Linux desktop or server based system:

1. /proc/meminfo file –
2. free command –
3. top command –
4. vmstat command –
5. dmidecode command –
6. Gnonome System Monitor gui tool –

Open a command-line terminal (select Applications > Accessories > Terminal), and then type the following commands:

$ cat /proc/meminfo

MemTotal:        8388608 kb
MemFree:         4033789 kB
Buffers:          133628 kB
Cached:          1735174 kB
SwapCached:            0 kB
Active:          1512812 kB
Inactive:        1024508 kB
Active(anon):    1170235 kB
Inactive(anon):    12566 kB
Active(file):     758121 kB
Inactive(file):  1136720 kB
Unevictable:        2388 kB
Mlocked:            2388 kB
HighTotal:       7400016 kB
HighFree:        4520172 kB
LowTotal:         789480 kB
LowFree:          511884 kB
SwapTotal:      15998968 kB
SwapFree:       15998968 kB
Dirty:               236 kB
Writeback:             0 kB
AnonPages:       1210488 kB
Mapped:           170524 kB
Shmem:             12424 kB
Slab:              65648 kB
SReclaimable:      46280 kB
SUnreclaim:        19368 kB
KernelStack:        3960 kB
PageTables:        10276 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    20093716 kB
Committed_AS:    2906208 kB
VmallocTotal:     122880 kB
VmallocUsed:       72700 kB
VmallocChunk:      23036 kB
HardwareCorrupted:     0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:       59384 kB
DirectMap2M:      851968 kB

The vmstat command can display memory statistics including additional information about processes, paging, block IO, traps, and cpu activity. Type the following command:
$ vmstat
$ vmstat -s

You can also use the dmidecode command for dumping a computer’s DMI (some say SMBIOS) table which can provide details about installed RAM and its speed:
# dmidecode --type memory
Sample outputs:

# dmidecode 2.10
SMBIOS 2.5 present.

Handle 0x0016, DMI type 16, 15 bytes
Physical Memory Array
	Location: System Board Or Motherboard
	Use: System Memory
	Error Correction Type: None
	Maximum Capacity: 64 GB
	Error Information Handle: Not Provided
	Number Of Devices: 8

Handle 0x0017, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x0016
	Error Information Handle: No Error
	Total Width: 72 bits
	Data Width: 64 bits
	Size: 2048 MB
	Form Factor: DIMM
	Set: 1
	Locator: DIMM1A
	Bank Locator: Bank1
	Type: DDR2
	Type Detail: Synchronous
	Speed: 667 MHz
	Manufacturer: 0000
	Serial Number: 00000000
	Asset Tag: Not Specified
	Part Number:                   

Handle 0x0018, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x0016
	Error Information Handle: No Error
	Total Width: Unknown
	Data Width: Unknown
	Size: No Module Installed
	Form Factor: DIMM
	Set: 1
	Locator: DIMM1B
	Bank Locator: Bank1
	Type: DDR2
	Type Detail: Synchronous
	Speed: 667 MHz
	Manufacturer:     
	Serial Number:         
	Asset Tag: Not Specified
	Part Number:                   

Handle 0x0019, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x0016
	Error Information Handle: No Error
	Total Width: 72 bits
	Data Width: 64 bits
	Size: 2048 MB
	Form Factor: DIMM
	Set: 1
	Locator: DIMM2A
	Bank Locator: Bank2
	Type: DDR2
	Type Detail: Synchronous
	Speed: 667 MHz
	Manufacturer: 0000
	Serial Number: 00000000
	Asset Tag: Not Specified
	Part Number:                   

Handle 0x001A, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x0016
	Error Information Handle: No Error
	Total Width: Unknown
	Data Width: Unknown
	Size: No Module Installed
	Form Factor: DIMM
	Set: 1
	Locator: DIMM2B
	Bank Locator: Bank2
	Type: DDR2
	Type Detail: Synchronous
	Speed: 667 MHz
	Manufacturer:     
	Serial Number:         
	Asset Tag: Not Specified
	Part Number:                   

Handle 0x001B, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x0016
	Error Information Handle: No Error
	Total Width: 72 bits
	Data Width: 64 bits
	Size: 2048 MB
	Form Factor: DIMM
	Set: 1
	Locator: DIMM3A
	Bank Locator: Bank3
	Type: DDR2
	Type Detail: Synchronous
	Speed: 667 MHz
	Manufacturer: 0000
	Serial Number: 00000000
	Asset Tag: Not Specified
	Part Number:                   

Handle 0x001C, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x0016
	Error Information Handle: No Error
	Total Width: Unknown
	Data Width: Unknown
	Size: No Module Installed
	Form Factor: DIMM
	Set: 1
	Locator: DIMM3B
	Bank Locator: Bank3
	Type: DDR2
	Type Detail: Synchronous
	Speed: 667 MHz
	Manufacturer:     
	Serial Number:         
	Asset Tag: Not Specified
	Part Number:                   

Handle 0x001D, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x0016
	Error Information Handle: No Error
	Total Width: 72 bits
	Data Width: 64 bits
	Size: 2048 MB
	Form Factor: DIMM
	Set: 1
	Locator: DIMM4A
	Bank Locator: Bank4
	Type: DDR2
	Type Detail: Synchronous
	Speed: 667 MHz
	Manufacturer: 0000
	Serial Number: 00000000
	Asset Tag: Not Specified
	Part Number:                   

Handle 0x001E, DMI type 17, 27 bytes
Memory Device
	Array Handle: 0x0016
	Error Information Handle: No Error
	Total Width: Unknown
	Data Width: Unknown
	Size: No Module Installed
	Form Factor: DIMM
	Set: 1
	Locator: DIMM4B
	Bank Locator: Bank4
	Type: DDR2
	Type Detail: Synchronous
	Speed: 667 MHz
	Manufacturer:     
	Serial Number:         
	Asset Tag: Not Specified
	Part Number:

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