Here are a few ways to find out which linux distro you are using :

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Fire up your favourite terminal program and type in the following

`dmesg | head -1  `

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The output would be similar to

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`Linux version 2.6.13-15-default (geeko@buildhost) (gcc version 4.0.2 20050901 (prerelease) (SUSE Linux)) #1 Tue Sep 13 14:56:15 UTC 2005`

• Using /proc/version

  In the terminal type

  cat /proc/version

  The output would be like

  Linux version 2.6.13-15-default (geeko@buildhost) (gcc version 4.0.2 20050901 (prerelease) (SUSE Linux)) \#1 Tue Sep 13 14:56:15 UTC 2005

• Using /etc/issue

  This method gives the most appropriate answer

  cat /etc/issue

  The output should be like

  `Welcome to SUSE LINUX 10.0 (i586) - Kernel \r (\l).`

Check out this↗ for a script to find out your Distro.