Check null value in xml Post: 302775235

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Top Forums Shell Programming and Scripting Check null value in xml Post 302775235 by Yoda on Monday 4th of March 2013 11:08:55 AM

03-04-2013

Moderator

Sure, here is the explanation of code:

Code:

awk -F'[<>]' '                                                  # Set < > as field separators.
BEGIN {                                                         # BEGIN block.
                cmd = "date +%Y%m%d%H%M%S"                      # Define cmd = "date +%Y%m%d%H%M%S"
} /<timestamp1>/ {                                              # Search for pattern: <timestamp1>
        if ( $3 == "" )                                         # If pattern found check if 3rd field is NULL (3rd field is tag value)
        {
                cmd | getline dt                                # Run cmd and read output in variable: dt
                close(cmd)                                      # Close cmd
                $0 = "<timestamp1>" dt "</timestamp1>"          # Set current record = <timestamp1> dt (current timestamp) </timestamp1>
        }
} 1 ' xml                                                       # 1 == true, so print current record.

I hope this helps.

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LEARN ABOUT CENTOS

trace-cmd-start

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

NAME

       trace-cmd-start - start the Ftrace Linux kernel tracer without recording

SYNOPSIS

       trace-cmd start [OPTIONS]

DESCRIPTION

       The trace-cmd(1) start enables all the Ftrace tracing the same way trace-cmd-record(1) does. The difference is that it does not run threads
       to create a trace.dat file. This is useful just to enable Ftrace and you are only interested in the trace after some event has occurred and
       the trace is stopped. Then the trace can be read straight from the Ftrace pseudo file system or can be extracted with trace-cmd-extract(1).

OPTIONS

       The options are the same as trace-cmd-record(1), except that it does not take options specific to recording (-s, -o, -F, -N, and -t).

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)

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-START(1)

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