Find out your computer architecture
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Sometimes, e.g. when you compile a kernel, you need to know your computer's architecture, also called platform. Existing platforms are listed here.
To find out the architecture your running kernel was built for, open a console and enter the command
uname --hardware-platform
and example response is
x86_64
Now there is a problem because on x64 hardware, both x64 and x86_32 kernels can run. To find out if your processor supports x86_64 commands, use the command
hwinfo --cpu | grep -m 1 Features
If lm (long mode) is in the list of features, your processor supports x86_64 commands.