hexdump - reversible hexdump


hexdump [ -n ] [ -f ] [ [ -i ] inputfile ] [ -o outputfile ]


hexdump is the standard utility for viewing binary files.

Together with hex2bin, hexdump is also a utility for editing binary files. First you hexdump the file, then you modify the dump-file in an editor, then you use hex2bin to produce the modified binary file.


causes hexdump to display all input data. Without this option, any number of output lines that are identical to the immediately preceding output line (except for the input offset), are replaced with a line comprised of a single asterisk. This makes output more concise e.g. if input contains a long sequence of one repeated byte value.

(flush-mode) causes hexdump to reflect its input immediately. Without this option, output is buffered (on ttys this means linebuffered, otherwise even blockbuffered). This option is especially useful, if you want to watch bytes as they are trickling out of a binary device. (e.g. /dev/mouse, /dev/ttyS1)

For obvious reasons, this implies -n.

[-i] inputfile
at most one inputfile can be given. if none is, then stdin will be used for input. (Giving more Inputfiles would have no sense.) On systems where textfiles and binaries are treated differently (such as MS-DOS) an inputFile should be given, as input-redirection may be flakey with binary data.

-o outputfile
at most one outputfile can be given. if none is, then stdout will be used for output.


none ;-)

See Also



Copyright (c) 2001 by Andreas Leitgeb (AvL)

Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation.