How to determine if my Unix Hardware is 64 bit ?

Use the following commands to determine the Hardware Architecture

AIX

bootinfo -y

SOLARIS

isainfo -vk

HP-UX

getconf HW_CPU_SUPP_BITS

or

getconf HW_32_64_CAPABLE

If the above command returns 1, hardware supports both 32 and 64 bit binaries

LINUX

grep flags /proc/cpuinfo

If the output of the above command contains the string “lm”, Hardware is 64 bit.

Example:

grep flags /proc/cpuinfo

flags : fpu 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 lm constant_tsc pni monitor ds_cpl est cid cx16 xtpr lahf_lm

Note: 64 bit capable Hardware does not mean your OS is 64 bit. Generally, for backward compatibility, 64 bit capable Hardware can run 32 bit Software.