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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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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]

56 comments fedilink hide all child comments

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] 17 points 1 year ago (17 children)

Write a bash script and add that script into cron job.

[–] [email protected] 8 points 1 year ago (16 children)

Any tutorials or links on how to do so? I am still a noob so I apologize in advance.

[–] [email protected] 6 points 1 year ago* (last edited 1 year ago) (1 children)

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.

[–] [email protected] 1 points 1 year ago

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

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