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How to make a command run everyday at a specific time? (lemmy.ml)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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I am on Mint XFCE and Redshift is just so inconsistent and I have tried its forks, also inconsistent. So instead I have been using sct in the terminal to adjust the temperature, and have set a command that resets it back to normal every time that I log on. However, I was wondering if there is a way to make it so that "sct 2750" runs every day at 10 pm or during a specific period of time.

Edit: I figured out the solution which was to create a crontab with the following line in it: 0 22 * * * env DISPLAY=:0 XAUTHORITY=$HOME/.Xauthority /usr/bin/sct 2750

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[–] [email protected] 1 points 1 year ago (2 children)

So I attempted to run a crontab and for whatever reason it does not do anything. What I put was * * * * * /usr/bin/sct 2750 after sudo crontab -e just to see if it even runs but it does not do anything. I rewrote and added multiple crontabs but no results. Any help would be appreciated.

[–] [email protected] 4 points 1 year ago* (last edited 1 year ago)

For the "schedule expression" (the * * * * * part), try https://crontab.guru/. Some distributions have shortcut expressions like @hourly or @daily so you don't have to type * */1 * * * etc.

The crontab generally has a header that shows the columns, but if not, they're: m h dom mon dow command.

From * * * * * /usr/bin/sct 2750 I'm guessing you want to run every minute. If that's the case, as another commented pointed out, try */1 * * * * /usr/bin/sct 2750, meaning every 1 minute.

[–] [email protected] 3 points 1 year ago* (last edited 1 year ago)

OK... So, just to test, edit your crontab and run a basic command:

*/1 * * * * date >> ~/date.log

this will append the current date/time once a minute (*/1) to a file in your home dir. You can check if it works with cat ~/date.log

If that works, then try again with your command. I see you used the full path to it, that's a good thing. Also, what does that command do if you run it manually?

To run the command at 10 PM every day, you should have it like this:

0 22 * * * /usr/bin/sct 2750