Schedule Nice Background Commands That Won't Die on Logout - Alternative to nohup and at

( trap '' 1; ( nice -n 19 sleep 2h && command rm -v -rf /garbage/ &>/dev/null && trap 1 ) & )
Check out the usage of 'trap', you may not have seen this one much. This command provides a way to schedule commands at certain times by running them after sleep finishes sleeping. In the example 'sleep 2h' sleeps for 2 hours. What is cool about this command is that it uses the 'trap' builtin bash command to remove the SIGHUP trap that normally exits all processes started by the shell upon logout. The 'trap 1' command then restores the normal SIGHUP behaviour. It also uses the 'nice -n 19' command which causes the sleep process to be run with minimal CPU. Further, it runs all the commands within the 2nd parentheses in the background. This is sweet cuz you can fire off as many of these as you want. Very helpful for shell scripts.

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What Others Think

Almost everything in this is unnecessary compared to http://www.commandlinefu.com/commands/view/3115/schedule-a-script-or-command-in-x-num-hours-silently-run-in-the-background-even-if-logged-out The one part that my post didn't have (the "nice") you got wrong. You need to put it after the &&; there's not much point being nice about "sleep" you know!
sitaram · 453 weeks and 2 days ago

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