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Running a command at a particular time


© August 2015 Anthony Lawrence

Anonymous asks:

I have a cron job that runs every hour. Within that script I need to test for specific times. For example, if today is the 27th and it is 4 AM, I need to run another script.

Of course you could do this with separate cron jobs, but if you want to maintain one script that you'll run hourly, it would look something like this:

#!/bin/bash
DOM=`date +%d`
HR=`date +%H`
if [ $DOM -eq 27 ]
then
  if [ $HR -eq 05 ]
  then 
  echo foo
  yourcommand
  fi
fi
 

Most of us wouldn't write it like that, though. We'd do:

#!/bin/bash
DOM=`date +%d`
HR=`date +%H`
if [ $DOM -eq 27 -a $HR -eq 04 ]
then
  echo foo
  yourcommand
fi
 

Watch your spacing - can't do "if [$HR -eq 05 ]" (no space after "[").


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