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Shell Programming and Scripting
Curious cron job question
Post 302370430 by Ashberry on Wednesday 11th of November 2009 10:33:08 AM
11-11-2009
Thanks for the replies guys!
@ thegeek
Yeah, you pretty much confirmed what I was afraid of. Lucky I didn't test it haha ouch.
@ Scrutinizer
Yeah, looks like I'll probably have to do something like that. I'm pretty sure I'm limited to creating new jobs via the cpanel in my case, but thinking I could setup two simple jobs, one to run a php script to generate a random time and store that somewhere as a string, then a second that runs more often which would only do something if a result matched the first generated time, using a simple if statement. That would make sure it only ran the every few days (via cron), and then only once at a random time.
Thanks for your help guys!
P.S. I suppose thinking about it, if the cron settings did work how I thought in my first post, it would ruin about 90% of everyone elses setups in the world wouldn't it.
@ thegeek
Yeah, you pretty much confirmed what I was afraid of. Lucky I didn't test it haha ouch.
@ Scrutinizer
Yeah, looks like I'll probably have to do something like that. I'm pretty sure I'm limited to creating new jobs via the cpanel in my case, but thinking I could setup two simple jobs, one to run a php script to generate a random time and store that somewhere as a string, then a second that runs more often which would only do something if a result matched the first generated time, using a simple if statement. That would make sure it only ran the every few days (via cron), and then only once at a random time.
Thanks for your help guys!
P.S. I suppose thinking about it, if the cron settings did work how I thought in my first post, it would ruin about 90% of everyone elses setups in the world wouldn't it.
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LEARN ABOUT LINUX
atd
ATD(8) System Manager's Manual ATD(8) NAME
atd - run jobs queued for later execution SYNOPSIS
atd [-l load_avg] [-b batch_interval] [-d] [-f] [-s] DESCRIPTION
atd runs jobs queued by at(1). OPTIONS
-l Specifies a limiting load factor, over which batch jobs should not be run, instead of the compile-time choice of 1.5. For an SMP system with n CPUs, you will probably want to set this higher than n-1. -b Specify the minimum interval in seconds between the start of two batch jobs (60 default). -d Debug; print error messages to standard error instead of using syslog(3). This option also implies -f. -f Run atd in the foreground. -s Process the at/batch queue only once. This is primarily of use for compatibility with old versions of at; atd -s is equivalent to the old atrun command. A script invoking atd -s is installed as /usr/sbin/atrun for backward compatibility. WARNING
atd won't work if its spool directory is mounted via NFS even if no_root_squash is set. FILES
/var/spool/cron/atjobs The directory for storing jobs; this should be mode 700, owner daemon. /var/spool/cron/atspool The directory for storing output; this should be mode 700, owner daemon. /etc/at.allow, /etc/at.deny determine who can use the at system. SEE ALSO
at(1), atrun(1), cron(8), crontab(1), syslog(3), at.deny(5), at.allow(5). BUGS
The functionality of atd should be merged into cron(8). 2009-11-14 ATD(8)