To get information about your kernel,
To see the release version, check if /etc hosts a file that tells you it; for example it could be called fedora-release, in which case
told you which Fedora release it was. On Debian it's debian-something and so on, so you'll have to see the file name yourself, for example with
for all options for that. For more precise information (not about the distribution as such, but the system in general) you could also read the files under /proc "filesystem".