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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 302593563 by thegeek on Friday 27th of January 2012 10:01:18 AM
Old 01-27-2012
Are you sure the 3rd party application writes everything to STDOUT ? Bcoz, you are likely to miss the stuffs printed on STDERR ... But when you execute manually and see output you are likely to miss where it prints .. So try doing with redirection of error to different place & confirm !
 

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LEARN ABOUT CENTOS

trace-cmd

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

NAME

       trace-cmd - interacts with Ftrace Linux kernel internal tracer

SYNOPSIS

       trace-cmd COMMAND [OPTIONS]

DESCRIPTION

       The trace-cmd(1) command interacts with the Ftrace tracer that is built inside the Linux kernel. It interfaces with the Ftrace specific
       files found in the debugfs file system under the tracing directory. A COMMAND must be specified to tell trace-cmd what to do.

COMMANDS

	   record  - record a live trace and write a trace.dat file to the
		     local disk or to the network.

	   report  - reads a trace.dat file and converts the binary data to a
		     ASCII text readable format.

	   hist    - show a histogram of the events.

	   options - list the plugin options that are available to *report*

	   start   - start the tracing without recording to a trace.dat file.

	   stop    - stop tracing (only disables recording, overhead of tracer
		     is still in effect)

	   extract - extract the data from the kernel buffer and create a trace.dat
		     file.

	   reset   - disables all tracing and gives back the system performance.
		     (clears all data from the kernel buffers)

	   split   - splits a trace.dat file into smaller files.

	   list    - list the available plugins or events that can be recorded.

	   listen  - open up a port to listen for remote tracing connections.

	   restore - restore the data files of a crashed run of trace-cmd record

	   stack   - run and display the stack tracer

	   check-events - parse format strings for all trace events and return
			  whether all formats are parseable

OPTIONS

       -h, --help
	   Display the help text.

       Other options see the man page for the corresponding command.

SEE ALSO

       trace-cmd-record(1), trace-cmd-report(1), trace-cmd-hist(1), trace-cmd-start(1), trace-cmd-stop(1), trace-cmd-extract(1),
       trace-cmd-reset(1), trace-cmd-restore(1), trace-cmd-stack(1), trace-cmd-split(1), trace-cmd-list(1), trace-cmd-listen(1), trace-cmd.dat(5),
       trace-cmd-check-events(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(1)
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