www.YoYoBrain.com - Accelerators for Memory and Learning Questions for Delayed execution - cron, at, sleep Category: all - (15 questions) Purpose of cron schedule tasks to run periodically in the future, can be daily, monthly, etc. Version of cron designed for systems that anacron aren't up 24x7 What tells cron when to run tasks crontab entries that are stored in cron schedule Command used to schedule one-time at processes that need to run at some point in future What is the format of each entry in crontab mins hrs day-of-month month weekday file command What is the syntax for a crontab entry to run 0,15,30,45 * * * * cmd cmd every 15 minutes entries can be comma separated What is crontab syntax to run cmd on the 1st 30 3 1-15 * * cmd day of month through 15th day at 3:30 am What directories in /etc are provided to make cron.daily creating daily, hourly, monthly, and weekly cron.hourly tasks easier on some systems cron.monthly cron.weekly How do you upload a schedule to crontab create a file with the crontab entries then system run: crontab filename it will overwrite any existing entries How do you get a list of current crontab crontab -l entries How do you remove all current crontab crontab -r entries How do you edit current crontab entries crontab -e directly How can you see what jobs have been atq (at queue) scheduled with command at Command to remove a command that has atrm been scheduled with at Command that simply waits a set amount of sleep seconds time.