很多时候我们需要得到linux下面的硬件信息，
那么如何得到呢？
其实linux给出了多种途径
我们看一下每一个命令，以便得到最详细的信息
/*
二,硬件的查看
1,lspci
2,dmidecode
3,dmesg
*/
1，查看pci的相关信息
先解释一下概念：
什么是PCI
Peripheral Component Interconnect，外围设备互联，
它是计算机上面应用的设备总线（总线，就是bus,是传输数据信号的通道）
lspci
这个命令默认是已经安装的，
如找不到此命令，可以安装pciutils这个包
命令举例:
lspci
00:00.0 Host bridge: Intel Corporation 5000X Chipset Memory Controller Hub (rev 12)
00:02.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port 2 (rev 12)
00:03.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port 3 (rev 12)
00:04.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8 Port 4-5 (rev 12)
00:05.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port 5 (rev 12)
00:06.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8 Port 6-7 (rev 12)
00:07.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port 7 (rev 12)
00:10.0 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev 12)
00:10.1 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev 12)
00:10.2 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev 12)
00:11.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved Registers (rev 12)
00:13.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved Registers (rev 12)
00:15.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers (rev 12)
00:16.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers (rev 12)
00:1c.0 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI Express Root Port 1 (rev 09)
00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #1 (rev 09)
00:1d.1 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #2 (rev 09)
00:1d.2 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #3 (rev 09)
00:1d.3 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB Controller #4 (rev 09)
00:1d.7 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset EHCI USB2 Controller (rev 09)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC Interface Controller (rev 09)
00:1f.1 IDE interface: Intel Corporation 631xESB/632xESB IDE Controller (rev 09)
01:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068E PCI-Express Fusion-MPT SAS (rev 08)
02:00.0 PCI bridge: Broadcom EPB PCI-Express to PCI-X Bridge (rev c3)
03:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet (rev 12)
04:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Upstream Port (rev 01)
04:00.3 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express to PCI-X Bridge (rev 01)
05:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream Port E1 (rev 01)
05:01.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream Port E2 (rev 01)
06:00.0 PCI bridge: Broadcom EPB PCI-Express to PCI-X Bridge (rev c3)
07:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708 Gigabit Ethernet (rev 12)
0e:0d.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)

从中看到的信息：Ethernet controller：这个是网卡
VGA compatible controller：这个是显卡
USB Controller： USB控制器
SCSI storage controller： SCSI的存储控制器
说明：如果你感觉这份信息还不够详细，
那么可以在后面添加参数，有3个参数可以使用：
lspci -v verbose 详细
lspci -vv very verbose 很详细
lspci -vvv even more verbose 更详细
以树结构来显示pci总线：
lspci -tv

简单显示：
lspci -n
00:00.0 0600: 8086:25c0 (rev 12)
00:02.0 0604: 8086:25e2 (rev 12)
00:03.0 0604: 8086:25e3 (rev 12)
00:04.0 0604: 8086:25f8 (rev 12)
00:05.0 0604: 8086:25e5 (rev 12)
00:06.0 0604: 8086:25f9 (rev 12)
00:07.0 0604: 8086:25e7 (rev 12)
00:10.0 0600: 8086:25f0 (rev 12)
00:10.1 0600: 8086:25f0 (rev 12)
00:10.2 0600: 8086:25f0 (rev 12)
00:11.0 0600: 8086:25f1 (rev 12)
00:13.0 0600: 8086:25f3 (rev 12)
00:15.0 0600: 8086:25f5 (rev 12)
00:16.0 0600: 8086:25f6 (rev 12)
00:1c.0 0604: 8086:2690 (rev 09)
00:1d.0 0c03: 8086:2688 (rev 09)
00:1d.1 0c03: 8086:2689 (rev 09)
00:1d.2 0c03: 8086:268a (rev 09)
00:1d.3 0c03: 8086:268b (rev 09)
00:1d.7 0c03: 8086:268c (rev 09)
00:1e.0 0604: 8086:244e (rev d9)
00:1f.0 0601: 8086:2670 (rev 09)
00:1f.1 0101: 8086:269e (rev 09)
01:00.0 0100: 1000:0058 (rev 08)
02:00.0 0604: 1166:0103 (rev c3)
03:00.0 0200: 14e4:164c (rev 12)
04:00.0 0604: 8086:3500 (rev 01)
04:00.3 0604: 8086:350c (rev 01)
05:00.0 0604: 8086:3510 (rev 01)
05:01.0 0604: 8086:3514 (rev 01)
06:00.0 0604: 1166:0103 (rev c3)
07:00.0 0200: 14e4:164c (rev 12)
0e:0d.0 0300: 1002:515e (rev 02)
显示其中的某一项：
lspci -d 14e4:164c -vvv
2,查看cpu的信息
cat /proc/cpuinfo

有几颗CPU？ cat /proc/cpuinfo ｜ grep physical id

[root@dev ~]# cat /proc/cpuinfo | grep \'physical id\'
physical id : 0
physical id : 0
physical id : 0
physical id : 0
如果physical id相同，表示这是一颗4核心的CPU

查看CPU的生产商和型号:
查看生产商：
cat /proc/cpuinfo | grep \'vendor_id\'
查看型号：
cat /proc/cpuinfo | grep \'model name\'
查看频率：
cat /proc/cpuinfo | grep \'cpu MHz\'
查看核心的数量：
cat /proc/cpuinfo | grep \'cpu cores\'


3,查看内存的信息：
[root@dev ~]# free -m
total used free shared buffers cached
Mem: 4048 1708 2339 0 164 1464
-/+ buffers/cache: 80 3967
Swap: 1983 0 1983
说明： -m参数，以M字节（megabytes）为单位查看内存大小，
上面的例子中我们可以看到，内存的总大小是4048M，也就是4G

想看到更详细的内存信息？
dmidecode -t memory
# dmidecode 2.7
SMBIOS 2.5 present.
Handle 0x1000, DMI type 16, 15 bytes.
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Multi-bit ECC
Maximum Capacity: 32 GB
Error Information Handle: Not Provided
Number Of Devices: 8
Handle 0x1100, DMI type 17, 28 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor:
Set: 1
Locator: DIMM1
Bank Locator: Not Specified
Type:
Type Detail: Synchronous
Speed: 667 MHz (1.5 ns)
Manufacturer: 830B8089830B
Serial Number: E2940445
Asset Tag: 110818
Part Number: NT1GT72U8PB1BN-3C
Handle 0x1101, DMI type 17, 28 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor:
Set: 1
Locator: DIMM2
Bank Locator: Not Specified
Type:
Type Detail: Synchronous
Speed: 667 MHz (1.5 ns)
Manufacturer: 830B8089830B
Serial Number: BB9C0441
Asset Tag: 110818
Part Number: NT1GT72U8PB1BN-3C
Handle 0x1102, DMI type 17, 28 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor:
Set: 2
Locator: DIMM3
Bank Locator: Not Specified
Type:
Type Detail: Synchronous
Speed: 667 MHz (1.5 ns)
Manufacturer: 830B8089830B
Serial Number: 39A10445
Asset Tag: 110818
Part Number: NT1GT72U8PB1BN-3C
Handle 0x1103, DMI type 17, 28 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor:
Set: 2
Locator: DIMM4
Bank Locator: Not Specified
Type:
Type Detail: Synchronous
Speed: 667 MHz (1.5 ns)
Manufacturer: 830B8089830B
Serial Number: BA9A0442
Asset Tag: 110818
Part Number: NT1GT72U8PB1BN-3C
Handle 0x1104, DMI type 17, 28 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor:
Set: 3
Locator: DIMM5
Bank Locator: Not Specified
Type:
Type Detail: Synchronous
Speed: Unknown
Manufacturer:
Serial Number:
Asset Tag:
Part Number:
Handle 0x1105, DMI type 17, 28 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor:
Set: 3
Locator: DIMM6
Bank Locator: Not Specified
Type:
Type Detail: Synchronous
Speed: Unknown
Manufacturer:
Serial Number:
Asset Tag:
Part Number:
Handle 0x1106, DMI type 17, 28 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor:
Set: 4
Locator: DIMM7
Bank Locator: Not Specified
Type:
Type Detail: Synchronous
Speed: Unknown
Manufacturer:
Serial Number:
Asset Tag:
Part Number:
Handle 0x1107, DMI type 17, 28 bytes.
Memory Device
Array Handle: 0x1000
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor:
Set: 4
Locator: DIMM8
Bank Locator: Not Specified
Type:
Type Detail: Synchronous
Speed: Unknown
Manufacturer:
Serial Number:
Asset Tag:
Part Number:
从上面我们可以看到有4条1G的内存被安装在前4条内存插槽上，而locator从DIMM5－DIMM8是空着的
前四条内存的型号为：Part Number: NT1GT72U8PB1BN-3C
生产商的ID是：Manufacturer: 830B8089830B