Cron

I do not like green eggs and cron, I do not like it Sam-I-Am.

I become very frustrated when I work on cron-related tasks, particularly on near-production equipment that has no sandbox. And I realize I could invest some time to install better tools- telnet clients, remote editors, etc, but it is hard to justify that effort when problems only come up every two-and-a-half years.

My workflow goes something like this: Freak out because cron is missing, then relax because the correct process is crond, not cron. Set up the command to run by command line. Once it is working properly, set up the command to run nightly via cron and move on to the next task.  It fails to run the next morning. Check the logs. Confirm the commands in the script file. No trouble found. Check for environment differences between direct shell interface and cron’s minimal environment. Yeah, there is a difference. Figure out which difference matters- don’t worry about the FVWM variables, HISTSIZE, etc. Figure out what the new mysteries are for; one of them is critical. In this case some new ODBC-INI lines and a PGCONNECT variable. Oh yes, in case you forgot, you have to transfer the files via command line in order to force the line terminators correctly… unless, perhaps, you’d rather spend time finding and testing a new FTP client?  And please remember that you must set the cron job to run in TWO minutes from now, giving cron one cycle to schedule its own crontab file so it runs on the next cycle. Yes, this adds uncomfortable delay to the testing process.
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And remember to note the times when the automated job did not run, so the monthly analysis based on timestamp is not improperly skewed.

Did it work? If not, wash rinse repeat.