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How can I tell from the Linux command line what kind of processor my machine has? E.g. AMD Opteron or Intel Core 2 Duo.

uname -a just tells me it's x86_64 but that isn't enough information.

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up vote 14 down vote accepted
dmidecode

or preferably

cat /proc/cpuinfo

dmidecode will give you a lot more info than just what processor, thou /proc/cpuinfo provides more info about the processor itself

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