We can get all the CPU information by viewing the file /proc/cpuinfo. It contains number of processors, vendor id, cpu family, model, model name, cpu MHz, cache memory information etc.,

linuxinternetworks ~ # cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 42
model name : Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz
stepping : 7
cpu MHz : 2294.869
cache size : 3072 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
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 nx rdtscp lm constant_tsc up arch_perfmon pebs bts xtopology tsc_reliable nonstop_tsc aperfmperf pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm ida arat epb xsaveopt pln pts dts
bogomips : 4589.73
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: