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Full Discussion: Detect changes to crontab
Top Forums Shell Programming and Scripting Detect changes to crontab Post 302847929 by MR.bean on Wednesday 28th of August 2013 05:15:34 AM
Old 08-28-2013
I just use a text file instead of a real crontab file to test

Code:
bash-3.2$ cat c1
* * * * * cmd 1
* * * * * cmd 2
* * * * * cmd 3
bash-3.2$ cat c2
* * * * * cmd 4
* * * * * cmd 5
* * * * * cmd 6
* * * * * cmd 1
bash-3.2$ 
bash-3.2$ bash c.sh
* * * * * cmd 4
* * * * * cmd 5
* * * * * cmd 6
bash-3.2$ 
bash-3.2$ 
bash-3.2$ cat c.sh
#!/bin/bash
DIFF=$(comm <(sort c1) <(sort c2) | awk -F "\t" 'length($2)>0{print $2}' )
if [ "${DIFF}" != "" ]
then
        IFS=$"\n";
        echo ${DIFF}
fi

 

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LEARN ABOUT CENTOS

trace-cmd-stop

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

NAME

       trace-cmd-stop - stop the Ftrace Linux kernel tracer from writing to the ring buffer.

SYNOPSIS

       trace-cmd stop

DESCRIPTION

       The trace-cmd(1) stop is a complement to trace-cmd-start(1). This will disable Ftrace from writing to the ring buffer. This does not stop
       the overhead that the tracing may incur. Only the updating of the ring buffer is disabled, the Ftrace tracing may still be inducing
       overhead.

       After stopping the trace, the trace-cmd-extract(1) may strip out the data from the ring buffer and create a trace.dat file. The Ftrace
       pseudo file system may also be examined.

       To disable the tracing completely to remove the overhead it causes, use trace-cmd-reset(1). But after a reset is performed, the data that
       has been recorded is lost.

SEE ALSO

       trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(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-STOP(1)
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