Basic UNIX/LINUX Commands

In my previous post you learned about how to Add and Delete user, How to create a file, how to get Memory Information and Partition Information using Unix commands.

Now in this article you will learn about how to get OS information and CPU information.

Few Basic UNIX/LINUX Commands

login as: root
root@192.168.0.14's password:
Last login: Fri Sep 14 16:52:04 2012 from gur-hello.com

Usage: uname [OPTION]...
Print certain system information.  With no OPTION, same as -s.

-a, --all                print all information, in the following order,
except omit -p and -i if unknown:
-s, --kernel-name        print the kernel name
-n, --nodename           print the network node hostname
-r, --kernel-release     print the kernel release
-v, --kernel-version     print the kernel version
-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
--help     display this help and exit
--version  output version information and exit

[root@VM-TEST ~]# uname -a
Linux VM-TEST.hello.com 2.6.32-220.el6.i686 #1 SMP Tue Dec 6 16:15:40 GMT 2011 i686 i686 i386 GNU/Linux

Following command show you OS with release:

[root@VM-TEST ~]# cat /etc/issue
CentOS release 6.2 (Final)
Kernel r on an m

Following command show your system’s version whether it is 64 bit or 32 bit:

[root@VM-TEST ~]# uname -m
i686

[root@VM-TEST ~]# more /etc/redhat-release
CentOS release 6.2 (Final)

Following command show you memory size:

[root@VM-TEST ~]# cat /proc/meminfo
MemTotal:        1030888 kB
MemFree:          353236 kB
Buffers:          186060 kB
Cached:           376336 kB
SwapCached:            0 kB
Active:           415704 kB
Inactive:         192580 kB
Active(anon):      46196 kB
Inactive(anon):     1168 kB
Active(file):     369508 kB
Inactive(file):   191412 kB
Unevictable:           0 kB
Mlocked:               0 kB
HighTotal:        141256 kB
HighFree:            280 kB
LowTotal:         889632 kB
LowFree:          352956 kB
SwapTotal:       1572856 kB
SwapFree:        1572856 kB
Dirty:                32 kB
Writeback:             0 kB
AnonPages:         45888 kB
Mapped:            31528 kB
Shmem:              1492 kB
Slab:              53132 kB
SReclaimable:      45520 kB
SUnreclaim:         7612 kB
KernelStack:        1592 kB
PageTables:         3424 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     2088300 kB
Committed_AS:     289848 kB
VmallocTotal:     122880 kB
VmallocUsed:        4516 kB
VmallocChunk:     112424 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:       10232 kB
DirectMap2M:      897024 kB

Following command show you CPU details:

[root@VM-TEST ~]# more /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 44
model name      : Intel(R) Xeon(R) CPU           E5620  @ 2.40GHz
stepping        : 2
cpu MHz         : 2394.000
cache size      : 12288 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss nx rdtscp lm constant_tsc up arc
h_perfmon pebs bts xtopology tsc_reliable nonstop_tsc aperfmperf unfair_spinlock
pni pclmulqdq ssse3 cx16 sse4_1 sse4_2 popcnt aes hypervisor lahf_lm ida arat d
ts
bogomips        : 4788.00
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

[root@VM-TEST ~]#