Linux Check Ram Speed and Type Commands

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How do I check RAM speed and type (line DDR or DDR2 or DDR3 or DDR4) without opening my computer? I need to purchase RAM and I need to know the exact speed and type installed. How do I find out ram information from a shell prompt? How can I check ram speed in Linux?

sudo dmidecode |grep -i “Type: DDR” |sort |uniq -c