Ubuntu下查看linux版本，内核版本，系统位数，gcc版本

1. 查看linux版本
  sunny@ubuntu:~$cat /etc/issue
Ubuntu 11.04 l
 
2. 查看内核版本
1) sunny@ubuntu:~$ cat /proc/version
Linux version 2.6.38-13-generic (buildd@rothera) (gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) ) #57-Ubuntu SMP Mon Mar 5 18:10:14 UTC 2012
2)  uname命令
sunny@ubuntu:~$ uname -a
Linux ubuntu 2.6.38-13-generic #57-Ubuntu SMP Mon Mar 5 18:10:14 UTC 2012 i686 i686 i386 GNU/Linux
 
[ -------------------------------------------------------------------------------
  -a, --all                print all information, in the following order,       查看全部信息
                             except omit -p and -i if unknown:
  -s, --kernel-name        print the kernel name                               查看内核名字
  -n, --nodename           print the network node hostname
  -r, --kernel-release     print the kernel release                              查看内核发行版本
  -v, --kernel-version     print the kernel version                              查看内核版本
  -m, --machine            print the machine hardware name
  -p, --processor          print the processor type or "unknown"           
  -i, --hardware-platform  print the hardware platform or "unknown"
  -o, --operating-system   print the operating system                      查看操作系统
      --help     display this help and exit
      --version  output version information and exit
--------------------------------------------------------------------------------------]
 
3.查看系统位数
1) sunny@ubuntu:~$ getconf WORD_BIT
32
2)sunny@ubuntu:~$ file /bin/bash
/bin/bash: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, stripped
 
4. 查看gcc版本
sunny@ubuntu:~$ gcc --version
gcc (Ubuntu/Linaro 4.5.2-8ubuntu4) 4.5.2