What kind of scripts is Crontab capable of running?

[Scysograph]

I have a very simple script to use as a test before I get more advanced with it, but it just doesn't seem to run even though it works fine from the terminal.

I just put this in my crontab

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@reboot /home/user/script

and this is the script.

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redshift -O 3000

The only reason I can think of that it isn't working is that it tries to run it before the X server is initialized.

This wouldn't be such problem for me if I could use shortcuts before I logged in, but now that I think about it users could have different shortcuts for the same bindings.

[1000]

Cron handles all scripts
The problem is different.

1. From user or from root account.
You can add a cron list as a user.
But people usually add the cron list as root.
Difference:
If you add as root / administrator the script will run under the root account
If you add from a user account it will run under the user account.

If you want add cron job from root. You can try run script from other user.

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sudo -u USER_NAME script

2. Launch rights.
Cron has fewer and fewer rights.
Sometimes You have to bring him back.
The script will run. But it can't start windows / applications with windows.
Workaround / Example:

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notify-send 'Boss !!' 'This working'

This will working from terminal. For Cron you need add something.
Example: export DISPLAY=:0.0 && export XAUTHORITY=/home/USER_NAME/.Xauthority && script
viewtopic.php?f=49&t=331950&p=1900455&h ... b#p1900455

After create Cron task, you can check all Cron tasks
viewtopic.php?p=1973411#p1973411

3. Delay

it tries to run it before the X server is initialized.

It can be true.
You can add delay for task. For example 5 seconds. ( You can add more seconds )

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@reboot  sleep 5s && /home/user/script