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HEXEDIT(1)		    General Commands Manual		    HEXEDIT(1)

NAME
       hexedit - view and edit files in	hexadecimal or in ASCII

SYNOPSIS
       hexedit	[-s  |	--sector] [-m |	--maximize] [-l<n> | --linelength <n>]
       [-h | --help] [filename]

DESCRIPTION
       hexedit shows a file both in ASCII and in hexadecimal. The file can  be
       a device	as the file is read a piece at a time. You can modify the file
       and search through it.

OPTIONS
       -s, --sector
	      Format the display to have entire	sectors.

       -m, --maximize
	      Try to maximize the display.

       --color
	      Display colors.  This feature is only available if your  operat-
	      ing system supports it.

       -l_n_, --linelength _n_
	      Explicitly set the number	of bytes to display per	line to	<n>.

       -h, --help
	      Show the usage.

COMMANDS (quickly)
   Moving
       <, > :  go to start/end of the file
       Right:  next character
       Left:   previous	character
       Down:   next line
       Up:     previous	line
       Home:   beginning of line
       End:    end of line
       PUp:    page forward
       PDown:  page backward

   Miscellaneous
       F2:     save
       F3:     load file
       F1:     help
       Ctrl-L: redraw
       Ctrl-Z: suspend
       Ctrl-X: save and	exit
       Ctrl-C: exit without saving

       Tab:    toggle hex/ascii
       Return: go to
       Backspace: undo previous	character
       Ctrl-U: undo all
       Ctrl-S: search forward
       Ctrl-R: search backward

   Cut&Paste
       Ctrl-Space: set mark
       Esc-W:  copy
       Ctrl-Y: paste
       Esc-Y:  paste into a file
       Esc-I:  fill

COMMANDS (full and detailed)
       o Right-Arrow, Left-Arrow, Down-Arrow, Up-Arrow - move the cursor.
       o Ctrl+F, Ctrl+B, Ctrl+N, Ctrl+P	- move the cursor.
       o  Ctrl+Right-Arrow,  Ctrl+Left-Arrow, Ctrl+Down-Arrow, Ctrl+Up-Arrow -
       move n times the	cursor.
       o Esc+Right-Arrow, Esc+Left-Arrow, Esc+Down-Arrow, Esc+Up-Arrow -  move
       n times the cursor.
       o Esc+F,	Esc+B, Esc+N, Esc+P - move n times the cursor.
       o Home, Ctrl+A -	go the beginning of the	line.
       o End, Ctrl+E - go to the end of	the line.
       o Page up, Esc+V, F5 - go up in the file	by one page.
       o Page down, Ctrl+V, F6 - go down in the	file by	one page.
       o _, Esc+_, Esc+Home - go to the	beginning of the file.
       o _, Esc+_, Esc+End - go	to the end of the file (for regular files that
       have a size).
       o Ctrl+Z	- suspend hexedit.
       o Ctrl+U, Ctrl+_, Ctrl+/	- undo all (forget the modifications).
       o Ctrl+Q	- read next input character and	insert it (this	is useful  for
       inserting control characters and	bound keys).
       o Tab, Ctrl+T - toggle between ASCII and	hexadecimal.
       o  /,  Ctrl+S  -	search forward (in ASCII or in hexadecimal, use	TAB to
       change).
       o Ctrl+R	- search backward.
       o Ctrl+G, F4 - go to a position in the file.
       o Return	- go to	a sector in the	file if	--sector is used, otherwise go
       to a position in	the file.
       o Esc+L - display the page starting at the current cursor position.
       o F2, Ctrl+W - save the modifications.
       o F1, Esc+H - help (show	the man	page).
       o Ctrl+O, F3 - open another file
       o  Ctrl+L  - redisplay (refresh)	the display (useful when your terminal
       screws up).
       o Backspace, Ctrl+H - undo the modifications made on the	previous byte.
       o Esc+Ctrl+H - undo the modifications made on the previous bytes.
       o Ctrl+Space, F9	- set mark where cursor	is.
       o Esc+W,	Delete,	F7 - copy selected region.
       o Ctrl+Y, Insert, F8 - paste (yank) previously copied region.
       o Esc+Y,	F11 - save previously copied region to a file.
       o Esc+I,	F12 - fill the selection with a	string
       o Esc+T - truncate the file at the current location
       o Ctrl+C	- unconditional	quit (without saving).
       o F10, Ctrl+X - quit.

       For the Esc commands, it	sometimes works	to use	Alt  instead  of  Esc.
       Funny things here (especially for froggies :) egrave = Alt+H , ccedilla
       = Alt+G,	Alt+Y =	ugrave.

   Modeline
       At the bottom of	the display you	have the modeline (copied from emacs).
       As in emacs, you	have the indications --, ** and	%% meaning unmodified,
       modified	and read-only. Then you	have the name of the file you're  cur-
       rently editing. Next to it is the current position of the cursor	in the
       file followed by	the total file size. The total file size  isn't	 quite
       correct for devices.
       While in	--sector mode, it shows	the sector the cursor is in.

   Editing
       You can edit in ASCII or	in hexadecimal.	You can	switch between the two
       with Tab. When the file is read-only, you can't edit it.	When trying to
       edit  a	read-only  file, a message "File is read-only" tells you it is
       non-writable.
       The modifications are shown in bold until they are saved.  The modeline
       indicates whether you have modified the file or not.
       When  editing  in  hexadecimal, only 0,1,...,9, a,b,...,f, A,B,...F are
       legal.  Other keys are unbound. The first time you hit an unbound  key,
       the help	pops up.  It won't pop again unless you	call the help directly
       (with F1).
       When editing in ascii, you can find it difficult	 to  enter  characters
       like / which are	bound to a function. The solution is to	use the	quoted
       insert function Ctrl+Q, the key after the quoted	insert function	is not
       processed  by hexedit (like emacs' quoted-insert, or like the \ charac-
       ter in C).

   Searching
       You can search for a string in ASCII or in hexadecimal. You can	switch
       between	the  two with Tab. If the string is found, the cursor is moved
       to the beginning	of the matching	location. If the search	failed,	a mes-
       sage  "not found" tells you so. You can cancel the search by pressing a
       key.
       The search in hexadecimal is a bit confusing. You must give a hexadeci-
       mal  string  with  an even number of characters.	The search can then be
       done byte by byte. If you want to search	a long number (eg:  a  32  bit
       number),	you must know the internal representation of that number (lit-
       tle/big endian problem) and give	it the way it is in memory. For	 exam-
       ple,  on	an Intel processor (little endian), you	must swap every	bytes:
       0x12345678 is written 0x78563412	in memory and that's  the  string  you
       must give to the	search engine.
       Before  searching you are asked if you want to save the changes,	if the
       file is edited.

       For  more  sophisticated	 search,  see	Volker	 Schatz's   patch   at
       <http://www.volkerschatz.com/unix/homebrew.html#hexedit>.

   Selecting, copying, pasting,	filling
       First,  select  the  part of the	buffer you want	to copy: start setting
       the mark	where you want.	Then go	to the end of the  area	 you  want  to
       copy  (you  can	use the	go to function and the search functions). Then
       copy it.	You can	then paste the copied area in the current file	or  in
       another file.

       You can also fill the selected area with	a string or a character: start
       choosing	the block you want to fill in (set mark	then move to  the  end
       of  the	block),	 and call the fill function (F12). hexedit ask you the
       string you want to fill the block with.
       The code	is not tuned for huge filling as it keeps the modifications in
       memory until you	save them. That's why hexedit will warn	you if you try
       to fill in a big	block.

       When the	mark is	set, the selection is shown in reverse mode.
       Be aware	that the copied	area contains the modifications	 done  at  the
       time of the copy. But if	you undo the modifications, it does not	change
       the content of the copy buffer. It seems	obvious	but it's worth saying.

   Scrolling
       The scrolling is	different whether you are in --sector mode or not.  In
       normal  mode,  the  scrolling  is  line	by  line.  In sector mode, the
       scrolling is sector by sector. In both modes, you can force the display
       to start	at a given position using Esc+L.

SEE ALSO
       od(1), hdump(1),	hexdump(1), bpe(1), hexed(1), beav(1).

AUTHOR
       Pixel (Pascal Rigaux) <pixel@rigaux.org>,
       Home page is <http://rigaux.org/>.

UNRESTRICTIONS
       hexedit	is  Open  Source; anyone may redistribute copies of hexedit to
       anyone under the	terms stated in	the GNU	General	Public License.

       You can find hexedit at
       <https://github.com/pixel/hexedit/archive/@1.5@.tar.gz>

TODO
       Anything	you think could	be nice...

LIMITATIONS
       There are problems with the curses library given	with Redhat  5.0  that
       make  hexedit think the terminal	is huge. The result is that hexedit is
       not usable.

       The shortcuts work on some machines, and	 not  on  others.  That's  why
       there  are  many	 shortcuts  for	each function. The Ctrl+Arrows and the
       Alt+. do	not work work as they should most of the time.	On  SUNs,  you
       must do Ctrl+V-Ctrl+V instead of	Ctrl+V (!); and	the Alt	key is the di-
       amond one.

       While searching,	it could be interesting	to  know  which	 position  the
       search  has  reached.  It's always nice to see something	moving to help
       waiting.

       The hexadecimal search could be able to search modulo 4 bits instead of
       8 bits.	Another	feature	could be to complete padd odd length hexadeci-
       mal searches with zeros.

BUGS
       I have an example where the display is completely screwed up. It	 seems
       to  be  a  bug  in ncurses (or maybe in xterm and rxvt)?? Don't know if
       it's me using ncurses badly or not... It	seems to happen	 when  hexedit
       leaves  only  one  space	at the end of the lines... If anyone has a (or
       the) solution, please tell me!

       If you have any problem with the	program	(even a	small one), please  do
       report it to me.	Remarks	of any kind are	also welcome.

				 12 July 1998			    HEXEDIT(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | COMMANDS (quickly) | COMMANDS (full and detailed) | SEE ALSO | AUTHOR | UNRESTRICTIONS | TODO | LIMITATIONS | BUGS

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