dd command is used to read, convert and output data. Data can be read from standard input or a file, converted to a specified format, and output to a file, device, or standard output.
Syntax format: dd [parameter]
Common parameters:
Example
# /dev/null，可以向它输出任何数据# /dev/zero，是一个输入设备，可以用它来初始化文件，该设备无穷尽地提供0 # 备份/dev/sdb全盘数据，使用gzip压缩并保存dd if=/dev/sdb | gzip > /root/image.gz # 将压缩的备份文件恢复到指定盘gzip -dc /root/image.gz | dd of=/dev/sdb # 测试硬盘的写速度dd if=/dev/zero bs=1024 count=1000000 of=/root/1Gb.file # 测试硬盘的读速度dd if=/root/1Gb.file of=/dev/null bs=64k
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