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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More Articles by Anthony Lawrence © 2015-08-06 Anthony Lawrence