is standard output. IBS = bytes
Read bytes at a time (that is, the size of a block is bytes ). Obs = bytes
Write bytes at a time (that is, the size of a block is bytes ). BS = bytes
Set the size of the read/write block to bytes, which can replace IBS and obs. CBS = bytes
Bytes are converted at a time, that is, the size of the conversion buffer. Skip = Blocks
The blocks are skipped from the beginning of the input file and then copied. Seek = Blocks
The blocks are skipped from the beginning of th
number of bytes read from the buffer zone.Skip = blocks skip the ibs * blocks block at the beginning of the read buffer.Obs = bytes: the number of bytes written to the buffer zone.Bs = bytes: set the number of bytes in the read/write buffer at the same time to set ibs and obs ).Cbs = byte: bytes are converted once.Count = blocks only copies the input blocks block.Conv = ASCII converts the EBCDIC code to the ASCIl code.Conv =
device name );Ibs = bytes: the number of bytes read from the buffer zone at a time;Skip = blocks skip the ibs * blocks block at the beginning of the read buffer;Obs = bytes: the number of bytes written to the buffer zone;Bs = bytes: set the number of bytes in the read/write buffer at the same time to set ibs and obs );Cbs = byte: one-time conversion of bytes;Count = blocks: only copy the input blocks block;Conv = ASCII converts an EBCDIC code to an A
to complete the diskcopy function. Note that you should delete the storage file on the hard disk with the RM command. Standard input files and standard output files are used by default. Syntax: dd [Option] If = input file (or device name ). Of = output file (or device name ). IBS = Bytes: the number of bytes read from the buffer zone. Skip = blocks skip the IBS * blocks block at the beginning of the read buffer. Obs = Bytes: the number of bytes written to the buffer zone. BS = Bytes: set the nu
at a time (default: 512)
If = the file is read from the specified file
Iflag = the symbols are read as specified in the comma-separated symbol list
Obs = number of bits written to the specified bits at a time (default: 512)
Of = write the file to the specified file
Oflag = the symbol is written as specified in the comma-separated symbol list
Seek = skip the specified number of blocks at the beginning of the output
Skip = number of parts skipping the specified number of parts at the beginning of
buffer.Obs = bytes Writes bytes bytes At a time, that is, the number of bytes written to the buffer.BS = bytes Sets the number of bytes in the read/write buffer (equal to the set IBS and OBS).CBS = Byte converts bytes bytes at a time.The count=blocks only copies the input blocks blocks.CONV = ASCII Converts the EBCDIC code to Ascil code.Conv = EBCDIC converts ascil code to
= bytes: set the number of bytes in the read/write buffer at the same time (equal to setting ibs and obs ).Cbs = byte: bytes are converted once.Count = blocks only copies the input blocks block.Conv = ASCII converts the EBCDIC code to the ASCIl code.Conv = ebcdic converts an ASCIl code to an EBCDIC code.Conv = IBM converts an ASCIl code to an alternate
This article explains how to create a file in linux: dd. Use the dd linux Command to create a certain size file.
Linux File Creation command: dd command
Copy the specified input file to the specified output file, and convert the format during the copy process. Syntax:
CODE: [Copy to clipboard] dd [Option 〕
QUOTE:
If = input file or device name ).
Of = output file or device name ).
Ibs = bytes: the number of bytes read from the buffer zone.
Skip = blocks skip the ibs * blocks block at the beginni
= ASCII converts the EBCDIC code to the ASCIl code.
Conv = ebcdic converts an ASCIl code to an EBCDIC code.
Conv = IBM converts an ASCIl code to an alternate EBCDIC code.
Conv = block converts a variable bit to a fixed character.
Conv = ublock converts a fixed bit to a variable bit.
Conv = ucase converts lowercase let
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.
Conv=conversion: Transforms the file with the specified parameters.
ASCII: convert EBCDIC to ASCII
EBCDIC: convert ASCII to
buffer.BS = bytes Sets the number of bytes in the read/write buffer (equal to the set IBS and OBS). CBS = Byte converts bytes bytes at a time. the Count=blocks only copies the input blocks blocks. CONV = ASCII Converts the EBCDIC code to Ascil code. conv = EBCDIC converts ascil code to EBCDIC code. CONV = IBM converts ascil code to alternate
written to the buffer.BS = bytes Sets the number of bytes in the read/write buffer (equal to the set IBS and OBS).CBS = Byte converts bytes bytes at a time.The count=blocks only copies the input blocks blocks.CONV = ASCII Converts the EBCDIC code to Ascil code.Conv = EBCDIC converts ascil code to EBCDIC code.CONV = IBM converts ascil code to alternate
=blocks only copies the input blocks blocks.CONV = ASCII Converts the EBCDIC code to Ascil code.Conv = EBCDIC converts ascil code to EBCDIC code.CONV = IBM converts ascil code to alternate EBCDIC code.CONV = Block Converts the change bit to a fixed character.CONV = Ublock Converts the fixed bit into a change bit.CONV =
Syntax: DD [Options]if = input file (or device name).of = output file (or device name).IBS = Bytes Reads bytes bytes At a time, that is, the number of bytes read into the buffer.Skip = Blocks skips the ibs*blocks block that reads into the beginning of the buffer.Obs = bytes Writes bytes bytes At a time, that is, the number of bytes written to the buffer.BS = bytes Sets the number of bytes in the read/write buffer (equal to the set IBS and OBS).CBS = Byte converts bytes bytes at a time.The count=
into a CD.#mount-O Loop/tmp/image.iso/mnt/cdromRelated Commands Umount
1.1 DD1.1.1 Function DescriptionRead, convert, and output data.
1.1.2 Syntaxdd [bs=
1.1.3 Supplementary noteDD can read data from standard inputs or files, transform data in a specified format, and then output to a file, device, or standard output.
1.1.4 parametersbs=cbs=
conv=
Conv = ASCII converts EBCDIC code to Ascil code.
Conv = EBC
at the beginning of the read buffer.
Obs = bytes: the number of bytes written to the buffer zone.
Bs = bytes: set the number of bytes in the read/write buffer at the same time (equal to setting ibs and obs ).
Cbs = byte: bytes are converted once.
Count = blocks only copies the input blocks block.
Conv = ASCII converts the EBCDIC code to the ASCIl code.
Conv = ebcdic converts an ASCIl code to an
complete the diskcopy function. Note that you should delete the storage file on the hard disk with the rm command. Standard input files and standard output files are used by default.
Syntax: dd [option]
If = input file (or device name ).
Of = output file (or device name ).
Ibs = bytes: the number of bytes read from the buffer zone.
Skip = blocks skip the ibs * blocks block at the beginning of the read buffer.
Obs = bytes: the number of bytes written to the buffer zone.
Bs =
database, except that the database separates the characters into two parts, which takes up to 6 characters in length. Therefore, if you need to support additional characters, it is recommended that you switch the character set of the database to the new Al32utf8.The UTF8 can be used in the database character set and also in the national character set.UtfeUTFE is a Unicode character set based on the EBCDIC platform, just like UTF8 on an ASCII platform
the input blocks blocks.
CONV = ASCII converts the EBCDIC code to an ASCII code.
Conv = EBCDIC converts ASCII code to EBCDIC code.
CONV = IBM converts ASCII code to alternate EBCDIC code.
CONV = Blick Converts the change bit to a fixed character.
CONV = Ublock Converts the fixation into a change bi
number of bytes in the read/write buffer (equal to the set IBS and OBS).CBS = Byte converts bytes bytes at a time.The count=blocks only copies the input blocks blocks.CONV = ASCII Converts the EBCDIC code to Ascil code.Conv = EBCDIC converts ascil code to EBCDIC code.CONV = IBM converts ascil code to alternate EBCDIC
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