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Get memory information in Ubuntu from the command line

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To get memory information from the command line, do: 
$: sudo lshw -class memory

The above command should show something like:
  *-firmware              
       description: BIOS
       vendor: Winbond Electronics
       physical id: 0
       version: A06
       date: 10/02/2005
       size: 64KiB
       capacity: 512KiB
       capabilities: isa pci pcmcia pnp upgrade shadowing cdboot bootselect int13floppy720 int5printscreen int9keyboard int14serial int17printer int10video acpi usb agp smartbattery biosbootspecification netboot
  *-cache:0
       description: L1 cache
       physical id: 700
       size: 8KiB
       capacity: 8KiB
       capabilities: internal write-back data
  *-cache:1
       description: L2 cache
       physical id: 701
       size: 2MiB
       capacity: 2MiB
       clock: 66MHz (15.0ns)
       capabilities: pipeline-burst internal varies unified
  *-memory
       description: System Memory
       physical id: 1000
       slot: System board or motherboard
       size: 2GiB
     *-bank:0
          description: DIMM DDR Synchronous 533 MHz (1.9 ns)
          vendor: Hynix Semiconductor (Hyundai Electronics)
          physical id: 0
          serial: 00005128
          slot: DIMM_A
          size: 1GiB
          width: 64 bits
          clock: 533MHz (1.9ns)
     *-bank:1
          description: DIMM DDR Synchronous 533 MHz (1.9 ns)
          vendor: Hynix Semiconductor (Hyundai Electronics)
          physical id: 1
          serial: 00004128
          slot: DIMM_B
          size: 1GiB
          width: 64 bits
          clock: 533MHz (1.9ns)
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