linux 查看系统版本

1. cat /proc/version
   Linux version 2.6.18-194.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Fri Apr 2 14:58:14 EDT 2010
2. uname -a
   Linux localhost.localdomain 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:14 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
3. uname -r
   2.6.18-194.el5
4. cat /etc/issue
   CentOS release 5.5 (Final)
   Kernel r on an m
5. cat /etc/redhat-release
   CentOS release 5.5 (Final)
6. file /bin/ls
   /bin/ls: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically linked (uses shared libs), for GNU/Linux 2.6.9, stripped