1.查看版本，内核
[root@localhost ~]# cat /etc/issue
CentOS release 5.5 (Final)
Kernel \r on an \m
[root@localhost ~]# cat /proc/version
Linux version 2.6.18-194.el5 (mockbuild@builder16.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Fri Apr 2 14:58:35 EDT 2010
[root@localhost ~]# uname -r
2.6.18-194.el5
2.查看操作系统位数
[root@localhost ~]# ls / #因为有lib64这个目录，所以操作系统就是64位的。
bin data etc lib64 media mnt opt root selinux sys usr
boot dev home lost+found misc net proc sbin srv tmp var
[root@localhost ~]# getconf LONG_BIT
32
2.查看cpu,内存
[root@localhost ~]# grep "model name" /proc/cpuinfo
model name : Intel(R) Core(TM) i5-2430M CPU @ 2.40GHz
[root@localhost ~]# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 42
model name : Intel(R) Core(TM) i5-2430M CPU @ 2.40GHz
stepping : 7
cpu MHz : 2394.649
cache size : 3072 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss nx rdtscp constant_tsc up ida nonstop_tsc arat pni ssse3 sse4_1 sse4_2 popcnt [8]
bogomips : 4789.29
[root@localhost ~]# grep MemTotal /proc/meminfo
MemTotal: 515308 kB
[root@localhost ~]# free
total used free shared buffers cached
Mem: 515308 452368 62940 0 30732 303712
-/+ buffers/cache: 117924 397384
Swap: 1048568 0 1048568