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Full Discussion: awk - coprocess???
Top Forums Shell Programming and Scripting awk - coprocess??? Post 302126264 by tmarikle on Tuesday 10th of July 2007 09:22:45 PM
Old 07-10-2007
Quote:
Originally Posted by Perderabo
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.
Haven't logged in for a while and I stumbled on this post.

I could never get awk to work as a coprocessor either. I was mentoring a coworker on coprocessors and while he was testing the fundamentals, I noticed that he wrapped awk in a shell script something like this:
Code:
Script cp.sh

#! /usr/bin/ksh -p

while :
do
    read LINE
    [[ "$LINE" = "QUIT" ]] && break

    print - "$LINE" | nawk '{
        if ( $0 ~ /^[0-9][0-9][0-9]/ ) {
            print "1"
        } else {
            print "0"
        }
    }'
done

Code:
./cp.sh |&

print -p 123

read -p VAR ; print $VAR
1

...which works well enough for easy text parsing.
 

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LEARN ABOUT LINUX

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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