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oasis-root

Compiled tree of Oasis Linux based on own branch at <https://hacktivis.me/git/oasis/> git clone https://anongit.hacktivis.me/git/oasis-root.git

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.