bs - This option is used to specify the block size, i.e., number of bytes or kilobytes(k) or megabytes(m)Ĥ. if - This option is used to specify an output file or deviceģ. If - This option is used to specify an input file or deviceĢ. The basic dd command syntax consists of the following:ġ. By default, the dd command reads from stdin and writes to stdout these can be modified using its input file and output file options. The dd command's syntax differs from various other Unix programs, as it uses syntax option=value rather than the standard syntax -option value or -option=value formats. Dd is a command-line utility for Linux and Unix systems whose primary purpose is to convert and create low-level file copy.
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