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Full Discussion: awk - coprocess???
Top Forums Shell Programming and Scripting awk - coprocess??? Post 302108887 by Perderabo on Thursday 1st of March 2007 12:33:00 PM
Old 03-01-2007
awk does not work as a coprocess for me. It hangs when I try to read a result and it probably is buffering the input. But you are redirecting the output of the coprocess back to standard-in anyway. I don't understand what you're trying to do with that script. Here is a script that uses a bc coprocess to add numbers (which works) and tries to uses an awk coprocess to add numbers (which hangs).
Code:
#! /usr/bin/ksh
bc |&
bcpid=$!

print -p 1 + 2
read -p result
echo bc says 1 + 2 = $result

print -p 1.75  + 3.25
read -p result
echo bc says 1.75 + 3.25 = $result

kill $bcpid
wait

set -x
awk '{print $1+$2}' |&
awkpid=$!

print -p 1 2
read -p result
echo awk says 1 + 2 = $result

print -p 1.75 3.25
read -p result
echo awk says 1.75 + 3.25 = $result

kill $awkpid
wait

exit 0

 

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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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