Code:
$ cat /proc/version
Linux version 2.4.21-0.13mdksecure (flepied@bi.mandrakesoft.com) (gcc version 3.2.2 (Mandrake Linux 9.1 3.2.2-3mdk)) #1 SMP Fri Mar 14 14:10:36 EST 2003
This provides kernel info, build dates, and possibly even the distribution and version.
There might also be a /etc/*-release file where the * corresponds to the linux distribution (/etc/SuSE-release, /etc/redhat-release, or /etc/mandrake-release).
Code:
$ cat /etc/mandrake-release
Mandrake Linux release 9.1 (Bamboo) for i586
Carl