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Full Discussion: Perl open(CMD, "cmd |"); buffering problem..
Top Forums Shell Programming and Scripting Perl open(CMD, "cmd |"); buffering problem.. Post 302593140 by Shawn, Lee on Wednesday 25th of January 2012 08:11:37 PM
Old 01-25-2012
Perl open(CMD, "cmd |"); buffering problem..
Hello,

There's a third-party application's command that shows the application's status like "tail -f verybusy.log". When use the command, the output comes every 1-sec. but when it goes in a script below the output comes every 8-sec...What is the problem and how can I fix it?

Code:
open(CMD, "/appbin/command |");
while(<CMD>){
        print;
}
close(CMD);

Thanks,
 

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LEARN ABOUT CENTOS

trace-cmd-check-events

TRACE-CMD-CHECK_EV(1)													     TRACE-CMD-CHECK_EV(1)

NAME

       trace-cmd-check-events - parse the event formats on local system

SYNOPSIS

       trace-cmd check-events [OPTIONS]

DESCRIPTION

       The trace-cmd(1) check-events parses format strings for all the events on the local system. It returns whether all the format strings can
       be parsed correctly. It will load plugins unless specified otherwise.

       This is useful to check for any trace event format strings which may contain some internal kernel function references which cannot be
       decoded outside of the kernel. This may mean that either the unparsed format strings of the trace events need to be changed or that a
       plugin needs to be created to parse them.

OPTIONS

       -N - Don't load plugins

SEE ALSO

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

AUTHOR

       Written by Vaibhav Nagarnaik, <vnagarnaik@google.com[1]>

RESOURCES

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

COPYING

       Copyright (C) 2011 Google, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).

NOTES

	1. vnagarnaik@google.com
	   mailto:vnagarnaik@google.com

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