Question

2

rtcwake cron does not work

rated 0 times [ 2] [ 0] / answers: 1 / hits: 8607 / 3 Years ago, fri, june 4, 2021, 4:40:02

I intend to put my computer to sleep every night and make it wake up again next morning. I found that rtcwake would serve my purpose. However putting it in the crontab does nothing. Following is my crontab entry for "root" user

0 1 * * * rtcwake -m disk -s 25200

I added it using 'sudo crontab -e'. The syslog shows that it executed the command, but the computer does not sleep. If I run the command on terminal directly, the computer is put to sleep immediately as expected. So I don't think there is any problem with ACPI.

Does anyone have a clue? I am on Ubuntu 14.04

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piscen

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3 Years ago

answered 3 Years ago feeous · Accepted Answer

Okay, I think I've found the solution. Adding a sudo before rtcwake solves the problem.

I now however have following question: Why does a root's crontab need sudo to run a command. Isn't it already running under root?