How to schedule something run once using anacron?

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http://unix.stackexchange.com – Frequently within my scripts I schedule auxiliary tasks for later in the form: at now + 8 hours <<< "rm -f workfile.$$ >> $worklog 2>&1 " or at 11pm + $(date +%M) minutes <<< "./postMarketJob.sh $orderID &> $orderID.log" Trouble is, sometimes the laptops or PCs I use as servers are off when the scheduled time comes, so the at job never happens. Same issue is true of crontab entries. I'm trying to make sense of anacron's man page for Ubuntu. Is there a tool to schedule a job such that it will run when requested, or at the earliest possibility whene (HowTos)