Linux Disk Management DD

Partition: Fdisk
Primary partition
Extended partitions (up to one)
Logical partition: The extension is divided
Only primary partitions and logical partitions can be formatted

Format: MKE2FS--mke2fs-j-L MYDATA/DEV/HDA5
-l:label to partition labels
-j: Log
-b:blk_size,1k,2k,4; default is 4K
Number of-i:inode, not less than block

To view or modify the label of a partition: E2label/dev/hda5 [Newlabel]


Mount: Mount to the directory tree and import it as a directory. The original data will be hidden
Mount/dev/hda5/mnt

Mount Disc: Mkdir/media/cdrom
Mount/dev/cdrom/media/cdrom

Unmout: Release the Mount.
Umount/dev/hda5 or Umount/mnt
The disc can only be removed after unloading: umount/dev/cdrom

Fuser: If in use, do not dismount the mount, check which thread is using:
Fuser/mnt
Fuser-km/mnt

DD: Copies a file with a block of the specified size and makes the specified conversion at the same time as the copy.

if= file name: Enter a file name, default to standard input. The source file is specified. < If=input file >
of= file name: Output file name, default is standard output. That is, the specified destination file. < Of=output file >
Ibs=bytes: Specifies an input block with block size of bytes bytes.
Obs=bytes: Specifies an output block size of bytes bytes.
Bs=bytes: The block size is bytes bytes for both read-in/output blocks.
Cbs=bytes: Converts bytes bytes at a time, that is, specifies the conversion buffer size.
Skip=blocks: Skips blocks blocks from the beginning of the input file before copying begins.
Seek=blocks: Skips blocks blocks from the beginning of the output file before copying begins.
Note: Usually only works when the output file is a disk or tape, that is, when backing up to disk or tape.
Count=blocks: Copies only blocks blocks, the block size equals the number of bytes specified by Ibs,obs,bs. does not specify the equivalent of copying all

1. Back up the local/dev/hdb full disk to the/DEV/HDD
DD If=/dev/hdb OF=/DEV/HDD

3. Restore the backup file to the specified disk
DD If=/root/image OF=/DEV/HDB

4. Back up the/DEV/HDB full data and compress it with the Gzip tool to save to the specified path
DD If=/dev/hdb | gzip >/root/image.gz

5. Restore the compressed backup file to the specified disk
gzip-dc/root/image.gz | DD Of=/dev/hdb

6. Generate an empty file with a size of 5G
$ dd If=/dev/zero of=tmp.5g bs=1g count=5

7. Append the top 1M of the file.in to the end of the File.out
$ File_out_size= ' Du-b file.out | awk ' {print '} '
$ dd if=./file.in ibs=1m count=1 of=./file.out seek=1 obs= $file _out_size

Linux Disk Management DD