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Full Discussion: How to pass values between awk and shell scripts
Top Forums Shell Programming and Scripting How to pass values between awk and shell scripts Post 302299295 by islegmar on Thursday 19th of March 2009 07:41:44 PM
Old 03-19-2009
Hi

Thanks for the reply but I get an error when using getline. Is getline an standard UNIX command (I'm using cygwin :-()? Can I use it inside an awk code?

My code is

Code:
awk -v inicio=$f1 -v fin=$f2 '
function compareDate(d1,d2)
{

  cmd=sprintf("date -d %s +%%s",d1);
  system(cmd)|getline s1;
  close(cmd);
  cmd=sprintf("date -d %s +%%s",d2);
  system(cmd)|getline s2;
  close(cmd);

  if (s1 > s2)
  {
    retVal=1;
  }
  else if ( s1=s2 )
  {
    retVal=0;
  }
  else
  {
    retVal=-1;
  }


  return retVal;
}

doprint==0 && compareDate($1,inicio)>=0 { doprint=1; }
doprint==1 && compareDate($1,fin)>=0    { exit; }
doprint==1 { print;  }

When I execute it, s1 and s2 are always empty and what I see in stdout is the ouput of the 'date' commands

Thanks a lot again

Isi
 

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LEARN ABOUT CENTOS

trace-cmd-listen

TRACE-CMD-LISTEN(1)													       TRACE-CMD-LISTEN(1)

NAME

       trace-cmd-listen - listen for incoming connection to record tracing.

SYNOPSIS

       trace-cmd listen -p port [OPTIONS]

DESCRIPTION

       The trace-cmd(1) listen sets up a port to listen to waiting for connections from other hosts that run trace-cmd-record(1) with the -N
       option. When a connection is made, and the remote host sends data, it will create a file called trace.HOST:PORT.dat. Where HOST is the name
       of the remote host, and PORT is the port that the remote host used to connect with.

OPTIONS

       -p port
	   This option will specify the port to listen to.

       -D
	   This options causes trace-cmd listen to go into a daemon mode and run in the background.

       -d dir
	   This option specifies a directory to write the data files into.

       -o filename
	   This option overrides the default trace in the trace.HOST:PORT.dat that is created when a remote host connects.

       -l filename
	   This option writes the output messages to a log file instead of standard output.

SEE ALSO

       trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1), trace-cmd-stop(1), trace-cmd-extract(1), trace-cmd-reset(1),
       trace-cmd-split(1), trace-cmd-list(1)

AUTHOR

       Written by Steven Rostedt, <rostedt@goodmis.org[1]>

RESOURCES

       git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git

COPYING

       Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).

NOTES

	1. rostedt@goodmis.org
	   mailto:rostedt@goodmis.org

								    06/11/2014						       TRACE-CMD-LISTEN(1)
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