Is your processor 32 or 64 bit?

To know if your CPU is 64 bit one, type the following command :

fool@localhost:~$ grep -w lm  /proc/cpuinfo

If you have an output like that containing the word lm, then you have 64 bit processor.

lm stands for Long mode which is only enabled for 64 bit CPU.

flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm tpr_shadow vnmi flexpriority
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm tpr_shadow vnmi flexpriority

The command uname -i can provide the kind of hardware-platform on which your OS is running. However, you may have unkown as an output of uname -i.

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