What is the command to know the linux version i am using?

I am using a Linux server in command mode, i dont know which linux i am using ie whether it is Fedora Core 1,2,3 or Redh Hat linux Enterpirse or Linux 9.0 Version??

What is the command to know the linux version i am using?
username@machine%26gt; uname -a


Linux test_machine1 2.4.21-4.ELsmp #1 SMP Fri Oct 3 17:52:56 EDT 2003 i686 i686 i386 GNU/Linux





In this example, the Linux kernel version is 2.4.21-4.








To obtain the Linux glibc version, type the following at the shell command prompt:





username@machine%26gt; rpm -q glibc


glibc-2.3.2-95.3





Two alternative methods to obtain glibc version information:


username@machine%26gt; /lib/libc.so.6 | head -1


GNU C Library stable release version 2.3.2, by Roland McGrath et al.





username@machine%26gt; getconf GNU_LIBC_VERSION


glibc 2.3.2





If you are using a RedHat Linux distribution, you can find the RedHat release by typing:


usename@machine%26gt; cat /etc/redhat-release


Red Hat Linux release 9 (Shrike)