To use a single command in converting from binary to ascii hex

Question

I am converting binary data into hex and viewing this hex data in head from a continuous stream. I run the following where the conversion is from here

echo "ibase=2;obase=10000;$(echo `sed '1q;d' /Users/masi/Dropbox/123/r3.raw`)" \ 
                                                                               \ 
| bc                                                                           \
                                                                               \  
| head

and I get

(standard_in) 1: illegal character: H

so wrong datatype.

How can you do the conversion form binary to binary ascii by a single command efficietly?

$(echo `sed '1q;d' /Users/masi/Dropbox/123/r3.raw`) should be returning a binary value for your full command to give any sensible output... u must get this command fixed first before any attempted conversion... — Arjun Mathew Dan, Jun 24 '15 at 12:36
@A.M.D No. I think I should be getting hex data. I am converting data from binary into hex and viewing it in less. — Léo Léopold Hertz 준영, Jun 24 '15 at 12:37
If u r looking to convert from hex to binary, ibase=16;obase=2 should be used... but your sed output is not hex either.. i see all sorts of alphabets in there.. fix ur sed command first... then change ibase and obase as required for conversion... — Arjun Mathew Dan, Jun 24 '15 at 12:42
I think the misunderstanding here is that `bc` with `ibase=2` expects the input to be ascii-formatted binary numbers, not raw binary data. Are you perhaps looking for something along the lines of the `hd` or `hexdump` tool? — Wintermute, Jun 24 '15 at 12:45
@Wintermute Your comment is the solution. I need to convert the binary data first to ascii-formatted binary. How can you do that? — Léo Léopold Hertz 준영, Jun 24 '15 at 12:48
That rather depends on what you consider to be a line in the binary file -- lines are usually a text file thing. Wildly guessing: for example, `hexdump -e '/4 "%08x\n"' r3.raw` would give you a 4-byte dword printed in hexadecimal on each line. — Wintermute, Jun 24 '15 at 12:50
@Wintermute Your command gives me like as an output `3e0ab60a 8c0a6d0a 3c0aa50a 980a5c0a 280aad0a b20a870a 520a9a0a`. So 4 bytes (8 characters in each thing). — Léo Léopold Hertz 준영, Jun 24 '15 at 12:51
Yes, that's the 4-byte double words in hexadecimal notation. It was a wild guess; I can't tell from the question what output you want. — Wintermute, Jun 24 '15 at 12:53
@Wintermute I have headers in my data separated by FAFAFAFA so I need to split events such that 100 events in one file etc. This thread is a part of this thread http://stackoverflow.com/q/31021731/54964 — Léo Léopold Hertz 준영, Jun 24 '15 at 12:56
@Wintermute Make your comment an answer and I will accept it. — Léo Léopold Hertz 준영, Jun 24 '15 at 13:02
@Wintermute I am trying to use your hexdump command for less here http://stackoverflow.com/q/31027735/54964. Just dump everything to less but let the user to read current dump and continuously dumping more and more. — Léo Léopold Hertz 준영, Jun 24 '15 at 13:21
@shellter I do not want tail because it is too slow in this application. Sed must be used. — Léo Léopold Hertz 준영, Jun 25 '15 at 05:08

score 0 · Accepted Answer · answered Jun 25 '15 at 05:15

0

I run the following code based on Wintermute's comment

hexdump -e '/4 "%08x\n"' r3.raw

For instance, head r3.raw | hexdump -e '/4 "%08x\n" gives

ffffffff
555eea57
...

answered Jun 25 '15 at 05:15

Léo Léopold Hertz 준영

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To use a single command in converting from binary to ascii hex

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