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# **blkid**
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## 说明
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在Linux下可以使用 **blkid命令** 对查询设备上所采用文件系统类型进行查询。blkid主要用来对系统的块设备（包括交换分区）所使用的文件系统类型、
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LABEL、UUID等信息进行查询。要使用这个命令必须安装e2fsprogs软件包
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## info
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```markdown
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用法：
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blkid -L <label> | -U <uuid>
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blkid [-c <file>] [-ghlLv] [-o <format>] [-s <tag>]
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[-t <token>] [<dev>]
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blkid -p [-s <tag>] [-O <offset>] [-S <size>]
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[-o <format>] <dev>
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blkid -i [-s <tag>] [-o <format>] <dev>
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选项：
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-c <file> read from <file> instead of reading from the default cache file (-c /dev/null means no cache)
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-d don't encode non-printing characters
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-h print this usage message and exit
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-g garbage collect the blkid cache
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-o <format> output format; can be one of:value, device, export or full; (default: full)
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-k list all known filesystems/RAIDs and exit
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-s <tag> show specified tag(s) (default show all tags)
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-t <token> find device with a specific token (NAME=value pair)
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-l look up only first device with token specified by -t
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-L <label> convert LABEL to device name
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-U <uuid> convert UUID to device name
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-V print version and exit
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<dev> specify device(s) to probe (default: all devices)
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Low-level probing options:
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-p low-level superblocks probing (bypass cache)
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-i gather information about I/O limits
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-S <size> overwrite device size
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-O <offset> probe at the given offset
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-u <list> filter by "usage" (e.g. -u filesystem,raid)
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-n <list> filter by filesystem type (e.g. -n vfat,ext3)
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```
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## 实例
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```bash
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blkid # 列出当前系统中所有已挂载文件系统的类型
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blkid -s UUID /dev/sda1 # 显示指定设备 UUID
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blkid -s LABEL /dev/sda5 # 显示指定设备label
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blkid -s TYPE # 显示设备文件系统
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blkid -o device # 显示所有设备
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blkid -o list # 以列表方式查看所有设备的相信信息
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```
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