如何查看Linux或者gcc版本

1. 查看Linux版本
cat/etc/issue
Linaro 12.07 \n \l

2. 查看内核版本
1)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
Linux version 3.4.29+ (ubuntu@linux-server) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #7 PREEMPT Mon Aug 5 13:37:28 CST 2013

2) uname命令
uname-a
Linux ubuntu 2.6.38-13-generic#57-Ubuntu SMP Mon Mar 5 18:10:14 UTC 2012 i686 i686 i386GNU/Linux
Linux ubuntu 3.4.29+ #7 PREEMPT Mon Aug 5 13:37:28 CST 2013 armv7l armv7l armv7l GNU/Linux

[-------------------------------------------------------------------------------
-a, --all print all information, inthe following order, 查看全部信息
except omit -p and -i ifunknown:
-s, --kernel-name print the kernelname 查看内核名字
-n, --nodename print the network nodehostname
-r, --kernel-release print the kernelrelease 查看内核发行版本
-v, --kernel-version print the kernelversion 查看内核版本
-m, --machine print the machinehardware name
-p, --processor print the processortype or "unknown"
-i, --hardware-platform print thehardware platform or "unknown"
-o, --operating-system print theoperating system 查看操作系统
--help display this help andexit
--version output version informationand exit
--------------------------------------------------------------------------------------]
3.查看系统位数
1) getconfWORD_BIT
32
2)file/bin/bash
/bin/bash: ELF 32-bit LSB executable,Intel 80386, version 1 (SYSV), dynamically linked (uses sharedlibs), for GNU/Linux 2.6.15, stripped
/bin/bash: ELF 32-bit LSB executable, ARM, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.31, BuildID[sha1]=0x1266f80916e3e59eb001459610510f5d05630297, stripped

4. 查看gcc版本
gcc--version
gcc (Ubuntu/Linaro 4.5.2-8ubuntu4)4.5.2
gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3

uname -a
gcc -v