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xxd.rst

xxd.rst 864 B
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  1. .. SPDX-License-Identifier: GPL-2.0+:
    2. 

  2. 

  3. xxd command
    4. 

  4. ===============
    5. 

  5. 

  6. Synopsis
    7. 

  7. --------
    8. 

  8. 

  9. ::
    10. 

  10. 

  11.     xxd <interface> <dev[:part]> <file>
    12. 

  12. 

  13. Description
    14. 

  14. -----------
    15. 

  15. 

  16. The xxd command prints the file content as hexdump to standard out.
    17. 

  17. 

  18. interface
    19. 

  19.     interface for accessing the block device (mmc, sata, scsi, usb, ....)
    20. 

  20. 

  21. dev
    22. 

  22.     device number
    23. 

  23. 

  24. part
    25. 

  25.     partition number, defaults to 1
    26. 

  26. 

  27. file
    28. 

  28.     path to file
    29. 

  29. 

  30. Example
    31. 

  31. -------
    32. 

  32. 

  33. Here is the output for a example text file:
    34. 

  34. 

  35. ::
    36. 

  36. 

  37.     => xxd mmc 0:1 hello
    38. 

  38.     00000000: 68 65 6c 6c 6f 20 77 6f 72 6c 64 0a 00 01 02 03  hello world.....
    39. 

  39.     00000010: 04 05                                            ..
    40. 

  40.     =>
    41. 

  41. 

  42. Configuration
    43. 

  43. -------------
    44. 

  44. 

  45. The xxd command is only available if CONFIG_CMD_XXD=y.
    46. 

  46. 

  47. Return value
    48. 

  48. ------------
    49. 

  49. 

  50. The return value $? is set to 0 (true) if the file is readable, otherwise it returns a non-zero error code.
    51.