Linux @lemmy.ml PrivateOnions @lemmy.ml 1y ago

How to make a command run everyday at a specific time?

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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56 comments

Write a bash script and add that script into cron job.
- Any tutorials or links on how to do so? I am still a noob so I apologize in advance.
  
  There's no need to be sorry for being noob. I also recognized that from your original post.
  
  Fast and short bash-scripting course with actually useful tasks:
  
  https://www.youtube.com/playlist?list=PLT98CRl2KxKGj-VKtApD8-zCqSaN2mD4w
  
  For cron write 'man cron' into your terminal and read the manpage docs on how to use cron. As already suggested 'crontab -e' is the command you need, but a quick look in the docs explains you how it actually works.
  
  I don't give you direct answers simply because I want you to learn Linux by yourself and enjoy the benefits of it :)
  
  Here is an alternative Piped link(s): https://piped.video/playlist?list=PLT98CRl2KxKGj-VKtApD8-zCqSaN2mD4w
  
  Piped is a privacy-respecting open-source alternative frontend to YouTube.
  
  I'm open-source, check me out at GitHub.
  
  Since you only need to run a single command as a user open terminal and give command 'crontab -e'. If you haven't set an editor it'll ask for one, pick nano.
  
  The syntax for crontab is like this (man 5 crontab will show it on your system as well):
  
  field allowed values ----- -------------- minute 0–59 hour 0–23 day of month 1–31 month 1–12 (or names, see below) day of week 0–7 (0 or 7 is Sun, or use names) command to run with full path
  
  So, in your case put in this line:
  
  0 10 * * * /usr/bin/sct 2750
  
  I'm not sure if sct is really at that path and I don't have that installed, so verify that first (run 'which sct'). Save the file and exit editor (ctrl+o, ctrl+x on nano). That's it. However, I don't quarantee results with that, since X with environment variables and all may cause issues, but if that's the case I'm sure this community can help with that as well.
  
  I am seriously confused because I follow multiple Youtube videos, and also came to the solution you suggested which is to run "which sct", and it ended up being /usr/bin/sct like you said but the command just does not run when the time comes. I am not sure what "X with environment variables" means so I would appreciate if you could explain and I can research further

56 comments