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# **dmidecode**
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## 说明
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**dmidecode命令** 可以让你在Linux系统下获取有关硬件方面的信息。dmidecode的作用是将DMI数据库中的信息解码，以可读的文本
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方式显示。由于DMI信息可以人为修改，因此里面的信息不一定是系统准确的信息。dmidecode遵循SMBIOS/DMI标准，其输出的信息包括
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BIOS、系统、主板、处理器、内存、缓存等等
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DMI（Desktop Management Interface,DMI）就是帮助收集电脑系统信息的管理系统，DMI信息的收集必须在严格遵照SMBIOS规范的前提
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下进行。SMBIOS（System Management BIOS）是主板或系统制造者以标准格式显示产品管理信息所需遵循的统一规范。SMBIOS和DMI是
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由行业指导机构Desktop Management Task Force(DMTF)起草的开放性的技术标准，其中DMI设计适用于任何的平台和操作系统
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DMI充当了管理工具和系统层之间接口的角色。它建立了标准的可管理系统更加方便了电脑厂商和用户对系统的了解。DMI的主要组成
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部分是Management Information Format(MIF)数据库。这个数据库包括了所有有关电脑系统和配件的信息。通过DMI，用户可以获取
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序列号、电脑厂商、串口信息以及其它系统配件信息
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```markdown
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Usage: dmidecode [OPTIONS]
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-d, --dev-mem FILE 从设备文件读取信息，输出内容与不加参数标准输出相同(默认: /dev/mem)
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-q, --quiet Less verbose output
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-s, --string KEYWORD 只显示指定DMI字符串的信息(string)
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-t, --type TYPE 只显示指定类型的信息(type)
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-u, --dump 显示未解码的原始条目内容
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--dump-bin FILE 将DMI数据转储到一个二进制文件中
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--from-dump FILE 从一个二进制文件读取DMI数据
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--no-sysfs Do not attempt to read DMI data from sysfs files
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--oem-string N Only display the value of the given OEM string
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```
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## dmidecode参数string及type列表如下
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（1）Valid string keywords are：
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* bios-vendor
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* bios-version
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* bios-release-date
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* system-manufacturer
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* system-product-name
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* system-version
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* system-serial-number
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* system-uuid
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* baseboard-manufacturer
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* baseboard-product-name
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* baseboard-version
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* baseboard-serial-number
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* baseboard-asset-tag
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* chassis-manufacturer
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* chassis-type
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* chassis-version
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* chassis-serial-number
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* chassis-asset-tag
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* processor-family
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* processor-manufacturer
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* processor-version
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* processor-frequency
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（2）Valid type keywords are：
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* bios
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* system
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* baseboard
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* chassis
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* processor
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* memory
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* Cache
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* connector
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* slot
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（3）type全部编码列表：
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* BIOS
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* System
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* Base Board
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* Chassis
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* Processor
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* Memory Controller
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* Memory Module
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* Cache
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* Port Connector
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* System Slots
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* On Board Devices
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* OEM Strings
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* System Configuration Options
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* BIOS Language
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* Group Associations
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* System Event Log
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* Physical Memory Array
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* Memory Device
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* 32-bit Memory Error
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* Memory Array Mapped Address
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* Memory Device Mapped Address
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* Built-in Pointing Device
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* Portable Battery
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* System Reset
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* Hardware Security
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* System Power Controls
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* Voltage Probe
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* Cooling Device
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* Temperature Probe
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* Electrical Current Probe
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* Out-of-band Remote Access
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* Boot Integrity Services
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* System Boot
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* 64-bit Memory Error
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* Management Device
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* Management Device Component
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* Management Device Threshold Data
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* Memory Channel
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* IPMI Device
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* Power Supply
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* Additional Information
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* Onboard Device
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## 实例
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```bash
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dmidecode -t 1 # 查看服务器信息
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dmidecode -s system-product-name # 查看硬件制造商
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dmidecode | grep 'Product Name' # 查看服务器型号
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dmidecode -s system-serial-number # 查看系统序列号
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dmidecode | grep 'Serial Number' # 查看主板的序列号
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dmidecode -t 2 # 查看主板信息
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dmidecode -t memory # 查看内存信息
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dmidecode -t 11 # 查看OEM信息
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dmidecode -t 17 # 查看内存条数
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dmidecode -t 16 # 查询内存信息
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dmidecode -t 4 # 查看CPU信息
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dmidecode -q | less # 显示SMBIOS/DMI 信息
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cat /proc/scsi/scsi # 查看服务器硬盘信息
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#不带选项执行dmidecode命令通常会输出所有的硬件信息。dmidecode命令有个很有用的选项-t，可以按指定类型输出相关信息，假如要获得处理器方面的信息，则可以执行：
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dmidecode -t processor
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dmidecode | grep -P -A5 "Memory\s+Device"|grep Size|grep -v Range # 查看内存的插槽数，已经使用多少插槽。每条内存多大，已使用内存多大
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dmidecode | grep -P 'Maximum\s+Capacity' # 查看支持的最大内存容量
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dmidecode | grep -A16 "Memory Device"|grep 'Speed' # 查看内存的频率
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dmidecode | grep -A16 "System Information$" # 查看主板详细信息
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```
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