[RELEASE] catedit.g4b - script to write hex values

Here is small .script (just below 1024 bytes) that allows to "hexedit" files or device sectors from command line.

Not particularly (please read as completely unlike ) foolproof , but less half-@§§ed than usual, actually working and potentially very dangerous .

Kids, play with this on something of which you have a copy or backup (bytes, once written, tend to stay written ).

!BAT
setlocal
if %1.==. goto :help
set ddwrite=%~dpnx0
set target=%1
shift
set offset=%1
if not exist offset goto :help
set /a offset=%offset% > nul
set /a counter=0 > nul

:p_loop
shift
if %1.==. goto :show
set /a skip=%offset%+%counter% > nul
cat --hex --skip=%skip% --length=1 %target% | set tbyte=
cat --hex --skip=%skip% --locate=\x%tbyte:~10,2% --number=1 --replace=\x%1 %target%
set /a counter=%counter%+1 > nul
goto :p_loop

:show
cat --hex --skip=%offset% --length=%counter% %target%
goto :EOF

:help
echo catedit.g4b - small script to write hex values (bytes) to file or device
echo - by jaclaz - completely FREE under Careware License
echo Usage:
echo catedit.g4b <target> <offset> [space separated hex values]
echo
echo Examples:
echo catedit.g4b (fd0)0+1 510 55 AA
echo will write the "Magic Bytes" 55AA on the first sector of first floppy device
echo
echo catedit.g4b (hd0,0)/boot.ini 54 3D 31 30
echo will write "=10" at offset 54 in the file (hd0,0)/BOOT.INI
goto :EOF

Wonko