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CentOS 7.0 - man page for hexedit (centos section 1)

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HEXEDIT(1)									       HEXEDIT(1)

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

SYNOPSIS
       hexedit [-s | --sector] [-m | --maximize] [-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 operating  system  supports
	      it.

       -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 (usefull 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 currently 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 \ character 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 message (``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 hexadecimal 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 (little/big endian problem) and give it the way it is in memory. For example, 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.volker-
       schatz.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  func-
       tion (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
       <http://rigaux.org/hexedit-1.2.13.src.tgz> and
       <http://rigaux.org/hexedit-1.2.13.bin.i386.dynamic.tgz>.

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  short-
       cuts 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 diamond 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 hexadecimal searches with zeros.

BUGS
       I  have	an  example  where  the  display is completly 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)


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