OS bit info.

SOLARIS

If Solaris has been configured for 32 bit, the output of:

isainfo -v

 will be:

32-bit sparc applications

If Solaris has been configured for 64 bit, the output of:

isainfo -v

 will be:

64-bit sparcv9 applications

32-bit sparc applications

OR:

isainfo -b

will return either 32 or 64

LINUX

uname -m

will return :

i386 or i686 then it is 32 bit 

x86_64 is 64bit