built-in hex editor? Post: 53802

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Top Forums Shell Programming and Scripting built-in hex editor? Post 53802 by Loriel on Monday 26th of July 2004 03:14:44 AM

07-26-2004

Registered User

@Perderabo
I don't think I have ksh. The default shell when opening the Terminal app is tcsh, but I'm most familiar with sh (which is bash in Darwin, I think). Anyways, I couldn't get echo \\0123 to work for me. The man pages in Darwin are a bit on the sketchy side. The man page for echo, for instance, tells me the format to use, describes the -n option briefly, and that it writes to the standard output. Not very informative, which might not matter for echo, but that's not the point. That's why all my learning has happened here and in Google groups. I also don't have adb. They might have it in a later release (I'm using Mac OS 10.2.2).

@Driver
That tip on how to write the hexadecimal values with printf is exactly what I needed. I used printf to pipe to dd and the patch worked perfectly.

@Anyone looking for a command line hex editor for Mac OS X
Here's the code I used if anyone's interested:

Code:

printf "\x1\x2\x3" | dd bs=1 count=3 seek=0x03 conv=notrunc of=myfile
hexdump -C hexdump-myfile

Explanation for newbies like me:
1) print 0x01 0x02 0x03
2) pipe to dd (block size = 1 byte, replace 3 blocks, skip to offset 0x03, do not truncate the file, apply output to myfile)

Viewing hexdump-myfile shows that myfile was patched:

Code:

00000000    00 00 00 01 02 03 00 00    00 00 00 00 00 00 00 00

Thanks for helping the newbie, guys!

Loriel

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LEARN ABOUT DEBIAN

odfhighlight

ODFHIGHLIGHT(1p)					User Contributed Perl Documentation					  ODFHIGHLIGHT(1p)

NAME

       odfhighlight - search, replace and highlight text in a document

SYNOPSIS

       odfhighlight "source.odt" "search string" -r "replacement" -o "target.odt"

       replaces "search string" by "replacement" in the file "source.odt", highlights each replacement with a yellow (default) backgound, then
       writes the resulting document as "target.odt"

       odfhighlight "myfile.odt" "search string" -color "green"

       highlights each occurrence of "search string" in "myfile.odt" with a green background color, without changing the text (without "-o"
       option, the changes apply to "myfile.odt"

ARGUMENTS AND OPTIONS

   Default behaviour
       With the "minimal" command line, with only a filename and a string as arguments, each matching string is highlighted with a yellow
       background and represented with the "Standard" style.

   Options
	       -e --encoding "xxxxxx"

		       character set to use, if different from the default

	       -r --replacement "new string"

		       "new string" is used as a replacement for "search string"

	       -c --color "code"

		       an RGB color code, expressed either as the concatenation of
		       3 comma-separated decimal values (each one in the range
		       0..255, ex: "72,61,139" for a dark slate blue), or a 6-digit
		       hexadecimal number, preceded by a "#" (ex: #00ff00 for green)
		       or, if a colormap is available and known in your
		       OpenOffice::OODoc installation, a symbolic color name (ex:
		       "sky blue")

	       -s --stylename "name"

		       the name of the color style (default: "MyHighlight"); the
		       user must provide a style name that is not already in use
		       in the document

	       -p --property "property=value"

		       This option can be repeated; each occurrence gives an
		       additional property for the highlight style (font name, size,
		       foreground color, ...). For example, with the combination of
		       -p 'fo:color=#ff0000' and -p 'fo:font-size=18pt', the
		       highlighted text will be made of 18pt-sized, red characters.
		       In order to master these options, you should have some
		       knowledge of the Form Objects (FO) vocabulary that is used
		       in the OpenDocument specification.

	       -o --output "filename"
	       -t --target "filename"

		       an alternative filename to save the modified document, when
		       the source document must remain unchanged

perl v5.14.2							    2010-01-11							  ODFHIGHLIGHT(1p)

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