Create an empty file of a specified size under Linux __linux

Use the DD this Linux command to create a certain size file.

Linux Create File command: DD command
Copies the specified input file to the specified output file, and can be converted to format during the copy process. Grammar:
Code:[copy to clipboard]dd(option)

QUOTE:

if = input file (or device name).

of = output file (or device name).

ibs = Bytes Read bytes bytes at a time, that is, the number of bytes read into the buffer.

Skip = Blocks skips the Ibs*blocks block at the beginning of the read 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 setting up Obs and OBS).

CBS = bytes Converts bytes bytes at a time.

Count = blocks only the blocks blocks that are entered.

CONV = ASCII converts EBCDIC code to ASCII code.

Conv = EBCDIC converts ASCII code to EBCDIC code.

CONV = IBM converts ASCII code to alternate EBCDIC code.

CONV = Blick Converts a bit of change to a fixed character.

CONV = ublock Converts fixed to change bit

CONV = UCase turns letters from lowercase to uppercase.

CONV = LCase Changes the letter from uppercase to lowercase.

CONV = Notrunc does not truncate the output file.

CONV = Swab Exchange Each pair of input bytes.

CONV = NoError does not stop processing when an error occurs.

Conv = sync the size of each input record to the size of the IBS (with IBS).

Fdformat command

Low-level formatted floppy disk.

Instance:
Create a 1GB empty file
DD If=/dev/zero of=aaa.txt bs=1000m count=1
The above is the Linux create File command: DD usage.