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Special Forums UNIX Desktop Questions & Answers cygwin error device or resource busy Post 302354277 by Corona688 on Thursday 17th of September 2009 04:06:38 PM
Old 09-17-2009
echo doesn't try to translate anything unless you tell it to. You can send arbitrary ASCII characters with echo like

Code:
# ctrl-Z
echo -en "\x1a" >&5

The -e part tells it to convert \x codes into ASCII characters. -n tells it not to apppend a newline.

I also have a suspicion this fd-opening thing is only working because 'echo' is a bash builtin so doesn't need to launch a new process. Try to avoid pipes and such to avoid unexpected problems writing to the serial device..

---------- Post updated at 02:06 PM ---------- Previous update was at 01:59 PM ----------

Code:
stty: /dev/ttyS3: unable to perform all requested operations

Did you make a typo? That's not the device you were using before.
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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