The easiest way on how to check what Debian version you are running is to simply read a content of /etc/issue file. Example:
root@debian:~# cat /etc/issue
Debian GNU/Linux 9 \n \l
However, the above command may not show the current Debian update point releases. Thus you may get more accurate info with the following linux command:
root@debian:~# cat /etc/debian_version
9.0
Next, you can check for /etc/os-release release file:
# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
NAME="Debian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

Here is a quick tip to add an official Debian CD disk to your /etc/apt/sources.list file to reduce package download requirement. Make sure that your CD is inserted to your CD-ROM drive and enter command:
# apt-cdrom add

In this config we will install SugarCRM CE the community edition of customer relationship management software by SugarCRM, Inc on Debian 7 "wheezy" Linux.

Download

The community edition of sugarCRM is licensed under AGPLv3. Current version of sugarCRM CE is 6.5.18. Head over to SugarCRM CE home page and download the latest full installation package or use the link and command below to download sugarCRM CE to your home directory:
# wget http://goo.gl/lzyQw2
Saving to: `SugarCE-6.5.18.zip'

100%[===========>] 21,267,418   722K/s   in 34s     

2014-10-20 06:09:54 (615 KB/s) - `SugarCE-6.5.18.zip' saved [21267418/21267418]

If you run Debian Wheezy 7 Linux as your main operating system and you wish to try open source real-time strategy and real-time tactics hybrid computer game WarZone 2100 then here is a short guide on how to install this game on your debian system.

First, download latest tar ball from official WarZone2100 git repository. Start by installing git and then download WarZone2100's latest source code:
# apt-get install git
$ git clone https://github.com/Warzone2100/warzone2100.git

Related sources.list repositories:
Wheezy, Jessie, Stretch, Buster

Security Updates

# /etc/apt/sources.list :
deb http://security.debian.org/ jessie/updates main contrib non-free
deb-src http://security.debian.org/ jessie/updates main contrib non-free

Australia Mirror

# /etc/apt/sources.list :
deb http://ftp.au.debian.org/debian/ jessie main contrib non-free
deb-src http://ftp.au.debian.org/debian/ jessie main contrib non-free

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