Cómo saber si nuestro procesador es de 32 ó 64 bits (Debian o Ubuntu)

A través del comando

#lshw -C cpu (se debe ejecutar como administrador del sistema)

nos mostrará la información relativa a los procesadores. Debemos fijarnos en el/los campo/s width.

*-cpu:0
description: CPU
product: Intel(R) Pentium(R) Dual CPU T2370 @ 1.73GHz
vendor: Intel Corp.
physical id: 4
bus info: cpu@0
version: 6.15.13
serial: 0000-06FD-0000-0000-0000-0000
slot: U2E1
size: 1733MHz
capacity: 1733MHz
width: 64 bits
clock: 133MHz
capabilities: boot fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx x86-64 constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm cpufreq
configuration: id=1
*-logicalcpu:0
description: Logical CPU
physical id: 1.1
width: 64 bits
capabilities: logical
*-logicalcpu:1
description: Logical CPU
physical id: 1.2
width: 64 bits
capabilities: logical
*-cpu:1
physical id: 1
bus info: cpu@1
version: 6.15.13
serial: 0000-06FD-0000-0000-0000-0000
size: 800MHz
capacity: 800MHz
capabilities: ht cpufreq
configuration: id=1
*-logicalcpu:0
description: Logical CPU
physical id: 1.1
capabilities: logical
*-logicalcpu:1
description: Logical CPU
physical id: 1.2
capabilities: logical