03-16-2010
Reverse hexdump without xxd
The "hexdump" command cannot perform reverse operation. On the other hand, the "xxd" command with -r option performs reverse hexdump, while the "xxd" command without -r performs the (forward) hexdump. An example of hexdump is to convert ABCD into 41 42 43 44. An example of reverse hexdump is to convert 41 42 43 44 back into ABCD.
The command "xxd" comes with Mac OS X. However, Linux may not come with "xxd". On a Linux that does not come with "xxd", how can reverse hexdump be achieved? Perhaps, vi editor?
Thanks in advance.
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LEARN ABOUT CENTOS
cd-read
CD-READ(1) User Commands CD-READ(1)
NAME
cd-read - reads Information from a CD or CD-image
SYNOPSIS
cd-read [OPTION...]
DESCRIPTION
-a, --access-mode=STRING
Set CD control access mode
-m, --mode=MODE-TYPE
set CD-ROM read mode (audio, auto, m1f1, m1f2, m2mf1, m2f2)
-d, --debug=INT
Set debugging to LEVEL
-x, --hexdump
Show output as a hex dump. The default is a hex dump when output goes to stdout and no hex dump when output is to a file.
-j, --just-hex
Don't display printable chars on hex dump. The default is print chars too.
--no-header
Don't display header and copyright (for regression testing)
--no-hexdump
Don't show output as a hex dump.
-s, --start=INT
Set LBA to start reading from
-e, --end=INT
Set LBA to end reading from
-n, --number=INT
Set number of sectors to read
-b, --bin-file[=FILE]
set "bin" CD-ROM disk image file as source
-c, --cue-file[=FILE]
set "cue" CD-ROM disk image file as source
-i, --input[=FILE]
set source and determine if "bin" image or device
-C, --cdrom-device[=DEVICE]
set CD-ROM device as source
-N, --nrg-file[=FILE]
set Nero CD-ROM disk image file as source
-t, --toc-file[=FILE]
set "TOC" CD-ROM disk image file as source
-o, --output-file=FILE
Output blocks to file rather than give a hexdump.
-V, --version
display version and copyright information and exit
Help options:
-?, --help
Show this help message
--usage
Display brief usage message
AUTHOR
Rocky Bernstein <rocky@gnu.org>
COPYRIGHT
Copyright (C) 2003-2005, 2007-2008, 2011-2013 R. Bernstein
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE. Have driver: GNU/Linux ioctl and MMC driver Have driver: cdrdao (TOC) disk image driver Have driver: bin/cuesheet disk image
driver Have driver: Nero NRG disk image driver Default CD-ROM device: /dev/sr0
SEE ALSO
cd-info(1) for information about a CD; cd-drive(1) for CD-ROM characteristics; iso-read(1) for information about an ISO-9660 image.
cd-read version 0.92 December 2013 CD-READ(1)