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Full Discussion: Parsing cron data with awk
Top Forums Shell Programming and Scripting Parsing cron data with awk Post 302766483 by Don Cragun on Monday 4th of February 2013 10:17:07 PM
Old 02-04-2013
Quote:
Originally Posted by Chubler_XL
A cronjob that runs every 6 mins would look like (V7 standard)
Code:
0,6,12,18,24,30,36,42,48,54 * * * *

or
Code:
0-54/6 * * * *

You should also consider some of these (should they be listed or not?):
Code:
* * * * 2 # every min on tuesdays
20-30 * * * * * # every min between 20 and 30 past hour
2-58/2 9-17 * * * # every 2 mins 9am - 5pm

Many systems still don't support / in the time fields (so check your cron and crontab man pages before worrying about /.

If your system supports / and one appears in the first field and the number after the / is less than 15, flag it.
Otherwise, if there is a - in the first field, flag it.
Otherwise, if there are one or more commas in the first field, sort the values separated by the commas and if the difference between any two adjacent values in the sorted list is less than 15, flag it. If the difference between the last value in the list and the (1st value in the list + 60) is less than 15, you have to determine if the hour field will ever yield consecutive hours. If it does, flag it. (Note that consecutive hours could also be hour 23 on one day and hour 0 on the next day, ... ... ...) Sorting the values in the minutes field is necessary because a minutes field of:
Code:
0,20,40,10,50,30

results in the job running every 10 minutes, but no two adjacent values are within 15 minutes of each other.

The logic isn't that hard, but there are enough special cases about which fields are considered depending on which fields have values specified in a crontab entry that this is not going to be a trivial task.

Good luck.
 

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ATRUN(8)						    BSD System Manager's Manual 						  ATRUN(8)

NAME
atrun -- run jobs queued for later execution SYNOPSIS
atrun [-l load_avg] [-d] DESCRIPTION
atrun runs jobs queued by at(1). Root's crontab(5) must contain the line: */10 * * * * root /usr/libexec/atrun so that atrun(8) gets called every ten minutes. At every invocation, every job in lowercase queues whose starting time has passed is started. A maximum of one batch job (denoted by upper- case queues) is started each time atrun is invoked. OPTIONS
-l load_avg Specifies a limiting load factor, over which batch jobs should not be run, instead of the compiled-in value of 1.5. -d Debug; print error messages to standard error instead of using syslog(3). WARNINGS
For atrun to work, you have to start up a cron(8) daemon. FILES
/var/at/spool Directory containing output spool files /var/at/jobs Directory containing job files SEE ALSO
at(1), crontab(1), syslog(3), crontab(5), cron(8) AUTHORS
Thomas Koenig <ig25@rz.uni-karlsruhe.de> BUGS
The functionality of atrun should be merged into cron(8). BSD
April 12, 1995 BSD
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