
- System -
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HOW TO install Ubuntu - complete guide
List of everyday used applications (in process)

To start script at boot type:
crontab -e
Now go to the bottom of the document and type:
@reboot /path/to/my/script/myscript
If you want to start script that needs to run sudo command start crontab with sudo, like:
sudo crontab -e
With crontab you can also start a script at every minute (m), every hour (h), day of the month(dom), month of the year(mon), day of the week (dow 0=Sunday).
I doubt you can start computer with it but you can shut it down every day at 20:00 by adding following line to crontab:
0 20 * * * /sbin/shutdown -h now