suckless linux base utils
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dd.1 (1516B)

      1 .Dd February 2, 2015
      2 .Dt DD 1
      3 .Os ubase
      4 .Sh NAME
      5 .Nm dd
      6 .Nd convert and copy a file
      7 .Sh SYNOPSIS
      8 .Nm
      9 .Op Ar operand...
     11 .Nm
     12 copies the standard input to the standard output. By default input data is
     13 read and written in 64kB blocks. When finished,
     14 .Nm
     15 displays the number of records read and written as well as the total number
     16 of bytes copied.
     17 .Nm
     18 syncs the filesystem once it is done copying. If you want to disable that use
     19 the
     20 .Ar nosync
     21 option.
     22 .Sh OPTIONS
     23 .Bl -tag -width Ds
     24 .It Ar bs Ns Op Ar =N
     25 If
     26 .Ar bs
     27 is not specified, the default blocksize is 64kB. If
     28 .Ar bs
     29 is specified
     30 without setting it to a specific value then an optimal value between the
     31 source and target filesystem will be selected. If this process fails it will
     32 fallback to the system's pagesize. Adjust
     33 .Ar N
     34 to set the block size of the transfers in bytes.
     35 .It Ar count=N
     36 Copy only
     37 .Ar N
     38 input blocks.
     39 .It Ar direct
     40 Use direct I/O for data.
     41 .It Ar if=file
     42 Read input from
     43 .Ar file
     44 instead of the standard input.
     45 .It Ar nosync
     46 Do not sync the filesystem once we are done copying.
     47 .It Ar quiet
     48 Enable quiet output.
     49 .It Ar of=file
     50 Write output to
     51 .Ar file
     52 instead of the standard output. If an initial portion of the output
     53 .Ar file
     54 is skipped using the seek operand, the output file is truncated at that
     55 point.
     56 .It Ar seek=N
     57 Seek
     58 .Ar N
     59 blocks from the beginning of the output before copying.
     60 .It Ar skip=N
     61 Skip
     62 .Ar N
     63 blocks from the beginning of the input before copying.
     64 .It Ar conv=notrunc
     65 Do not truncate the output file.
     66 .El