How to create a hex dump of file containing only the hex characters without spaces in bash

Question

How do I create an unmodified hex dump of a binary file in Linux using bash  The od and hexdump commands both insert spaces in the dump and this is not ideal   Is there a way to simply write a long string with all the hex characters  minus spaces or newlines in the output

User · Answer

It seems to depend on the details of the version of od. On OSX, use this:

od -t x1 -An file |tr -d '\n '

(That's print as type hex bytes, with no address. And whitespace deleted afterwards, of course.)

User · Answer

Format strings can make hexdump behave exactly as you want it to  no whitespace at all  byte by byte    hexdump -ve  1 1    2x     1 1 means  each format is applied once and takes one byte   and    2x  is the actual format string  like in printf  In this case  2-character hexadecimal number  leading zeros if shorter

User · Answer

Perl one-liner   perl -e  local     print unpack  H     lt  gt   file

User · Answer

xxd -p file  Or if you want it all on a single line  xxd -p file   tr -d   n

User · Answer

tldr    od -t x1 -A n -v  lt empty zip   tr -dc    xdigit     amp  amp  echo  504b0506000000000000000000000000000000000000    Explanation  Use the od tool to print single hexadecimal bytes  -t x1  --- without address offsets  -A n  and without eliding repeated  quot groups quot   -v  --- from empty zip  which has been redirected to standard input  Pipe that to tr which deletes  -d  the complement  -c  of the hexadecimal character set     xdigit      You can optionally print a trailing newline  echo  as I ve done here to separate the output from the next shell prompt  References   https   pubs opengroup org onlinepubs 9699919799 utilities od html https   pubs opengroup org onlinepubs 9699919799 utilities tr html

User · Answer

The other answers are preferable  but for a pure Bash solution  I ve modified the script in my answer here to be able to output a continuous stream of hex characters representing the contents of a file   Its normal mode is to emulate hexdump -C

User · Answer

I think this is the most widely supported version  requiring only POSIX defined tr and od behavior   cat  quot  file quot    od -v -t x1 -A n   tr -d    n   This uses od to print each byte as hex without address without skipping repeated bytes and tr to delete all spaces and linefeeds in the output  Note that not even the trailing linefeed is emitted here   The cat is intentional to allow multicore processing where cat can wait for filesystem while od is still processing previously read part  Single core users may want replace that with  lt   quot  file quot  od     to save starting one additional process

[linux] How to create a hex dump of file containing only the hex characters without spaces in bash?

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