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I had a script that automatically enables my wifi without using networkmanager, but I don't know how to run the script as root while the system is booting. How do I make the script run automatically during boot?

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3 Answers 3

up vote 12 down vote accepted

Place the script you want to run in the /etc/init.d directory and make the script executable.

chmod 755 myscript

Once that is done create a symbolic link in the run level directory you would like to use, for example if you wanted to run a program in the graphical runlevel 2, the default runlevel for Ubuntu, you would place it in the /etc/rc2.d directory. You just cannot place it the directory, you must signify when it will run by indicating the startup with an “S” and the execution order is important. Place it after everything else that is in the directory by giving it a higher number.

If the last script to be run is rc.local and it is named S99rc.local then you need to add your script as S99myscript.

ln -s /etc/init.d/myscript /etc/rc3.d/S99myscript

Each backward compatible /etc/rc*.d directory has symbolic links to the /etc/init.d/ directory.

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Thanks man, that solved my problem . –  user128712 May 4 '13 at 6:25
Note that under Ubuntu Server 14.04, I needed to use /etc/rc2.d, instead of rc3.d as indicated in the example. It seems rc2.d isn't just the graphical run level. –  Brad Dec 24 '14 at 3:52

Include the command in /etc/rc.local. It will be run whenever the user's runlevel changes.

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Note: you have to put the command before the last line in /etc/rc.local that contains: exit 0 –  rubo77 Oct 14 '14 at 20:02

use a crontab option to make your script run after reboot,

you can do it by adding @reboot code in cron

    @reboot yourScriptPath 

will do it

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