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补充 Flag 参数. 

Signed-off-by: rick.chan <chenyang@autoai.com>
This commit is contained in:
rick.chan 2020-12-22 11:02:29 +08:00
parent 51313692ca
commit 2d84e23265
1 changed files with 16 additions and 11 deletions
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23
Software/Applications/DD/DD_命令的使用.md
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@ -19,14 +19,19 @@ dd iflag=direct,nonblock if=\<in file name\> oflag=direct,nonblock of=/dev/\<out
多个 Flag 之间可以用逗号分割，含义如下表。
| flags | Description |
|-----------|----------------------------------------------|
| direct | 读写数据采用直接 IO 方式 |
| directory | 读写失败除非是 directory |
| dsync | 读写数据采用同步 IO |
| sync | 同上，但是针对元数据 |
| fullblock | accumulate full blocks of input |
| nonblock | 读写数据采用非阻塞 IO 方式 |
| noatime | 读写数据不更新访问时间 |
| Flag | Description |
|-------------|-------------------------------------------------------------------|
| append | append mode (makes sense only for output; conv=notrunc suggested) |
| direct | use direct I/O for data |
| directory | fail unless a directory |
| dsync | use synchronized I/O for data |
| sync | likewise, but also for metadata |
| fullblock | accumulate full blocks of input (iflag only) |
| nonblock | use non-blocking I/O |
| noatime | do not update access time |
| nocache | Request to drop cache. See also oflag=sync |
| noctty | do not assign controlling terminal from file |
| nofollow | do not follow symlinks |
| count_bytes | treat 'count=N' as a byte count (iflag only) |
| skip_bytes | treat 'skip=N' as a byte count (iflag only) |
| seek_bytes | treat 'seek=N' as a byte count (oflag only) |