How to Identify OS 64 bit or 32 bit

Check whether OS is 64 bit or 32 bit.
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On Solaris,

SQL> !/usr/bin/isainfo -kv
64-bit amd64 kernel modules

SQL> !/usr/bin/isainfo -v
64-bit amd64 applications
cx16 mon sse3 pause sse2 sse fxsr mmx cmov amd_sysc cx8 tsc fpu
32-bit i386 applications
cx16 mon sse3 pause sse2 sse fxsr mmx cmov sep cx8 tsc fpu

This output tells us that solaris operating systems allow co-existence of 32-bit and 64-bit files.

On AIX,
$ getconf -a | grep KERN
$ file /usr/lib/boot/unix*
On Linux,

On HP-UX,
/usr/bin/ getconf KERNEL_BITS
/usr/bin/file /stand/vmunix

Linux:

getconf LONG_BIT
gives 32/64 bit..

though it's common sense that 64 bit os cannot sit on 32 bit proc , x86 in uname -m are indication of 32 bit processor rahter than kernel


On linux,

$uname -a
Linux debian 2.6.18-4-686 #1 SMP Wed May 9 23:03:12 UTC 2007 i686 GNU/Linux

If the output is x86_64 then 64-bit and i686 or similar for 32-bit.

On windows,

Start>All Programs>accessories> System Tools>System Information>look for under System summary.

Or start>run>dixdiag>Then check for WHQL digital signature.