To find your Linux distribution and version you can try the following commands:
(Please note that the command output varies for different Linux distros)
1. dmesg | head -1
2. cat /proc/version
3. cat /etc/issue
4. cat /etc/*-release
/etc/SuSE-release for SUSE Linux
/etc/redhat-release for Redhat Linux
5. cat /etc/slackware-version
6. uname -a
7. /etc/debian_version (only for Debian)