Você pode usar este script perl :
#!/usr/bin/perl
# Base on http://search.cpan.org/~pkent/Schedule-Cron-Events-1.8/cron_event_predict.plx
# initial release 20091001
use warnings;
use strict;
use Schedule::Cron::Events;
use Getopt::Std;
use Time::Local;
use vars qw($opt_f $opt_h $opt_p);
getopts('p:f:h');
if ($opt_h) { usage(); }
my $filename = shift || usage();
my $future = 2;
if (defined $opt_f) { $future = $opt_f; }
my $past = 0;
if (defined $opt_p) { $past = $opt_p; }
open (IN, "<$filename") || die "Unable to open '$filename' for read: $!";
while(<IN>) {
my $obj = new Schedule::Cron::Events($_) || next;
chomp;
print "# Original line: $_\n";
if ($future) {
for (1..$future) {
my $date = localtime( timelocal($obj->nextEvent) );
print "$date - predicted future event\n";
}
}
$obj->resetCounter;
if ($past) {
for (1..$past) {
my $date = localtime( timelocal($obj->previousEvent) );
print "$date - predicted past event\n";
}
}
print "\n";
}
close IN;
sub usage {
print qq{
SYNOPSIS
$0 [ -h ] [ -f number ] [ -p number ] <crontab-filename>
Reads the crontab specified and iterates over every line in it, predicting when
each cron event in the crontab will run. Defaults to predicting the next 2 events.
-h - show this help
-f - how many events predited in the future. Default is 2
-p - how many events predicted for the past. Default is 0.
EXAMPLE
$0 -f 2 -p 2 ~/my.crontab
\$Revision\$
};
exit;
}
=pod
=head1 NAME
cron_event_predict - Reads a crontab file and predicts when event will/would have run
=head1 SYNOPSIS
cron_event_predict.plx [ -h ] [ -f number ] [ -p number ] <crontab-filename>
=head1 DESCRIPTION
A simple utility program mainly written to provide a worked example of how to use the module,
but also of some use in understanding complex or unfamiliar crontab files.
Reads the crontab specified and iterates over every line in it, predicting when
each cron event in the crontab will run. Defaults to predicting the next 2 events.
These are the command line arguments:
-h - show this help
-f - how many events predited in the future. Default is 2
-p - how many events predicted for the past. Default is 0.
Here's an example, showing the default of the next 2 predicted occurences of the each cron job:
dev~/src/cronevent > ./cron_event_predict.plx ~/bin/crontab
# Original line: 1-56/5 * * * * /usr/local/mrtg-2/bin/mrtg /home/admin/mrtg/mrtg.cfg
Thu Sep 26 00:41:00 2002 - predicted future event
Thu Sep 26 00:46:00 2002 - predicted future event
# Original line: 34 */2 * * * /home/analog/analogwrap.bash > /dev/null
Thu Sep 26 02:34:00 2002 - predicted future event
Thu Sep 26 04:34:00 2002 - predicted future event
# Original line: 38 18 * * * /home/admin/bin/allpodscript.bash > /dev/null
Thu Sep 26 18:38:00 2002 - predicted future event
Fri Sep 27 18:38:00 2002 - predicted future event
And here's an example showing past events too:
dev~/src/cronevent > ./cron_event_predict.plx -f 1 -p 3 ~/bin/crontab
# Original line: 1-56/5 * * * * /usr/local/mrtg-2/bin/mrtg /home/admin/mrtg/mrtg.cfg
Thu Sep 26 00:41:00 2002 - predicted future event
Thu Sep 26 00:36:00 2002 - predicted past event
Thu Sep 26 00:31:00 2002 - predicted past event
Thu Sep 26 00:26:00 2002 - predicted past event
# Original line: 34 */2 * * * /home/analog/analogwrap.bash > /dev/null
Thu Sep 26 02:34:00 2002 - predicted future event
Thu Sep 26 00:34:00 2002 - predicted past event
Wed Sep 25 22:34:00 2002 - predicted past event
Wed Sep 25 20:34:00 2002 - predicted past event
# Original line: 38 18 * * * /home/admin/bin/allpodscript.bash > /dev/null
Thu Sep 26 18:38:00 2002 - predicted future event
Wed Sep 25 18:38:00 2002 - predicted past event
Tue Sep 24 18:38:00 2002 - predicted past event
Mon Sep 23 18:38:00 2002 - predicted past event
=cut
SAÍDA DA AMOSTRA:
# Original line: 03 05 * * * /bin/bash command1
Thu Dec 25 05:03:00 2014 - predicted future event
Fri Dec 26 05:03:00 2014 - predicted future event
# Original line: 10 06 * * * size=$(du -h ~/.xsession-errors); [[ $size =~ ^[O-9]+G ]] && :> ~/.xsession-errors
Thu Dec 25 06:10:00 2014 - predicted future event
Fri Dec 26 06:10:00 2014 - predicted future event
# Original line: 21 06 * * 1 perl WWW::Monitor.pl
Mon Dec 29 06:21:00 2014 - predicted future event
Mon Jan 5 06:21:00 2015 - predicted future event