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From: Steven Jones on 18 May 2006 14:47
Is it possible to send specific byte sequences from the shell command
line to a file? Imagine I want to dump into a file the following byte
sequence

04 11 32 7e 08 27 66 13

where each two digit group is the ASCII hex representation of a character.
The problem is in the nonprintable characters. How can they be handled
from the shell command line?


From: John W. Krahn on 18 May 2006 15:45
Steven Jones wrote:
> Is it possible to send specific byte sequences from the shell command
> line to a file? Imagine I want to dump into a file the following byte
> sequence
>
> 04 11 32 7e 08 27 66 13
>
> where each two digit group is the ASCII hex representation of a character.
> The problem is in the nonprintable characters. How can they be handled
> from the shell command line?

perl -e'print "\x04\x11\x32\x7e\x08\x27\x66\x13"' > yourfile



John
--
use Perl;
program
fulfillment
From: Sven Mascheck on 18 May 2006 16:05
John W. Krahn wrote:
> Steven Jones wrote:
>> [...] send specific byte sequences from the shell command line

> perl -e'print "\x04\x11\x32\x7e\x08\x27\x66\x13"' > yourfile

printf '\x04\x11\x32\x7e\x08\x27\x66\x13'

> John
> use Perl;

Sven
type printf;
From: Chris F.A. Johnson on 18 May 2006 16:54
On 2006-05-18, Steven Jones wrote:
> Is it possible to send specific byte sequences from the shell command
> line to a file? Imagine I want to dump into a file the following byte
> sequence
>
> 04 11 32 7e 08 27 66 13
>
> where each two digit group is the ASCII hex representation of a character.
> The problem is in the nonprintable characters. How can they be handled
> from the shell command line?

for c in 04 11 32 7e 08 27 66 13
do
printf "%b" "\x$c"
done

--
Chris F.A. Johnson, author <http://cfaj.freeshell.org>
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
===== My code in this post, if any, assumes the POSIX locale
===== and is released under the GNU General Public Licence
From: Daniel P. Valentine on 18 May 2006 19:42
In article <pan.2006.05.18.18.47.38.780527(a)sjones.org>,
Steven Jones <sjones(a)sjones.org> wrote:

> Is it possible to send specific byte sequences from the shell command
> line to a file? Imagine I want to dump into a file the following byte
> sequence
>
> 04 11 32 7e 08 27 66 13
>
> where each two digit group is the ASCII hex representation of a character.
> The problem is in the nonprintable characters. How can they be handled
> from the shell command line?

For a low-tech method assuming bash's echo, try

echo -e "\x04\x11\x32\x7e\x08\x27\x66\x13" > yourfile

The -e option tells it to interpret the \x sequences as the
corresponding characters.

--
dpv
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