sbase

suckless unix tools
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dd.1 (1979B)

      1 .Dd 2020-04-28
      2 .Dt DD 1
      3 .Os sbase
      4 .Sh NAME
      5 .Nm dd
      6 .Nd convert and copy a file
      7 .Sh SYNOPSIS
      8 .Nm
      9 .Op Ar operand Ns ...
     10 .Sh DESCRIPTION
     11 .Nm
     12 copies its input to its output, possibly after conversion, using
     13 the specified block sizes,
     14 .Pp
     15 The following operands are available:
     16 .Bl -tag -width ibs=expr
     17 .It Cm if= Ns Ar file
     18 Read from the file named by
     19 .Ar file
     20 instead of standard input.
     21 .It Cm of= Ns Ar file
     22 Write to the file named by
     23 .Ar file
     24 instead of standard output.
     25 .It Cm ibs= Ns Ar expr
     26 Set the input block size to
     27 .Ar expr
     28 (defaults to 512).
     29 .It Cm obs= Ns Ar expr
     30 Set the output block size to
     31 .Ar expr
     32 (defaults to 512).
     33 .It Cm bs= Ns Ar expr
     34 Set the input and output block sizes to
     35 .Ar expr .
     36 Additionally, if no conversion other than
     37 .Cm noerror ,
     38 .Cm notrunc ,
     39 or
     40 .Cm sync
     41 is specified, input blocks are copied as single output blocks, even
     42 when the input block is short.
     43 .It Cm skip= Ns Ar n
     44 Skip
     45 .Ar n
     46 input blocks before starting to copy.
     47 .It Cm seek= Ns Ar n
     48 Skip
     49 .Ar n
     50 output blocks before starting to copy.
     51 .It Cm count= Ns Ar n
     52 Copy at most
     53 .Ar n
     54 input blocks.
     55 .It Cm conv= Ns Ar value Ns Op , Ns Ar value Ns ...
     56 Apply the conversions specified by
     57 .Ar value .
     58 .Bl -tag -width Ds
     59 .It Cm lcase
     60 Map uppercase characters to the corresponding lowercase character
     61 using
     62 .Fn tolower .
     63 .It Cm ucase
     64 Map lowercase characters to the corresponding uppercase character
     65 using
     66 .Fn toupper .
     67 .It Cm swab
     68 Swap each pair of bytes in the input block.
     69 If there is an odd number of bytes in a block, the last one is
     70 unmodified.
     71 .It Cm noerror
     72 In case of an error reading from the input, do not fail.
     73 Instead, print a diagnostic message and a summary of the current
     74 status.
     75 .It Cm notrunc
     76 Do not truncate the output file.
     77 .It Cm sync
     78 In case of a partial input block, pad with null bytes to form a
     79 complete block.
     80 .El
     81 .El
     82 .Sh STANDARDS
     83 The
     84 .Nm
     85 utility is compliant with the
     86 .St -p1003.1-2008
     87 specification, except that it does not implement the
     88 .Cm block
     89 and
     90 .Cm unblock
     91 conversions.