Debian is an open source operating system for support server and desktop. We can use different commands to find out Debian operating system version, kernel version and 32 bit or 64 bit.

Debian Version?

# cat /etc/debian_version
# lsb_release -a

No LSB modules are available.
Distributor ID:    Debian
Description:    Debian GNU/Linux 7.6 (wheezy)
Release:    7.6
Codename:    wheezy
# cat /etc/issue

Debian GNU/Linux 7 \n \l

Kernel Version?
# uname -r

# uname -a

Linux debian 3.2.0-4-686-pae #1 SMP Debian 3.2.60-1+deb7u1 i686 GNU/Linux
# uname -mrs

Linux 3.2.0-4-686-pae i686
# uname -m

32 Bit or 64 Bit?
#  getconf LONG_BIT