write bytes given as hex sequences into a file at a given offset, with sfk setbytes for Windows, Mac OS X, Linux and Raspberry Pi.

• Download the free Swiss File Knife Base from Sourceforge.
• Open the Windows CMD command line, Mac OS X Terminal or Linux shell.
• OS X : type mv sfk-mac-64.exe sfk and chmod +x sfk then ./sfk
• Linux: type mv sfk-linux-64.exe sfk and chmod +x sfk then ./sfk. OS X and Linux syntax may differ, check the help within the tool.

sfk setbytes filename offset [data] [data2] [...]
sfk ... +setbytes filename offset

write binary or text data into a target file at an offset.

data can be given as a series of byte blocks each
starting with 0x or as plain text. all data parameters
are joined into one long byte block which cannot be
larger than 100000 bytes.

options
   -dump  create a hexdump of the changed output.
          by default only the input is shown.
   -spat  support slash patterns like foo\tbar.
          type "sfk help pat" for details.
   -repeat=n  repeat the next data n times.

command chaining
   accepts binary chain input.

see also
   sfk hexdump    show binary file contents
   sfk partcopy   copy part of a file

examples
   sfk setbytes out.dat 20 0xf1f2f3f4 "foo bar"
      write 4 bytes with codes f1, f2, f3, f4 into
      out.dat at offset 20 followed by the words
      "foo", a space, and "bar".
   sfk setbytes out.dat 20 -spat "foo\tbar" 0x00
      write "foo" then a TAB character then "bar"
      followed by a binary zero. note that a slash
      pattern does not support \x00 zero bytes.
   sfk echo 0xf1f2f3f4 +hextobin +setbytes out.dat 20
      write 4 bytes prepared by previous commands.
   sfk echo -pure "c:\foo.dat" +setbytes out.dat 20
      write a filename string as pure as possible,
      without pattern interpretation or (CR)LF,
      into out.dat at offset 20.
   sfk setbytes out.dat 0 -repeat=10000 a -spat "\n"
      fill the first 10000 bytes of out.dat with
      character a then add a single line feed.
 

sfk setbytes filename offset [data] 
   [data2] [...]
sfk ... +setbytes filename offset

write binary or text data into a target 
file at an offset.

data can be given as a series of byte 
blocks each starting with 0x or as plain
text. all data parameters are joined into
one long byte block which cannot be larger
than 100000 bytes.

options
   -dump  create a hexdump of the changed 
          output. by default only the input
          is shown.
   -spat  support slash patterns like 
          foo\tbar. type "sfk help pat" for
          details.
   -repeat=n  repeat the next data n times.

command chaining
   accepts binary chain input.

see also
   sfk hexdump    show binary file 
                  contents
   sfk partcopy   copy part of a file


examples
   sfk setbytes out.dat 20 0xf1f2f3f4 "foo 
   bar"
      write 4 bytes with codes f1, f2, f3, 
      f4 into out.dat at offset 20 followed
      by the words "foo", a space, and
      "bar".
   sfk setbytes out.dat 20 -spat "foo\
   tbar" 0x00
      write "foo" then a TAB character then 
      "bar" followed by a binary zero. note
      that a slash pattern does not support
      \x00 zero bytes.
   sfk echo 0xf1f2f3f4 +hextobin +setbytes 
                         out.dat 20
      write 4 bytes prepared by previous 
      commands.
   sfk echo -pure "c:\foo.dat" +setbytes 
              out.dat 20
      write a filename string as pure as 
      possible, without pattern
      interpretation or (CR)LF, into out.
      dat at offset 20.
   sfk setbytes out.dat 0 -repeat=10000 a 
                            -spat "\n"
      fill the first 10000 bytes of out.dat 
      with character a then add a single
      line feed.
 

read more about all sfk functions

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