How to give sudo access to a bash script?

Question

I have a bash script(chbr.sh) to change my display brightness from terminal as my brightness keys doesn't work.

`sudo setpci -s 00:02.0 F4.B=30`

Now, every time I run that script it asks for password which I don't like. So, I googled a little and found out that one can edit /etc/sudoers file to disable the password feature.

So, I edited my sudoers file with the below content

ronnie ALL = (ALL) NOPASSWD: /home/ronnie/chbr.sh

Now when I run my script as ./chbr.sh it again asks for my password. So, is this not the right way to give sudo access to a bash script or what am I doing wrong here.

ronnie@ronnie:~$ ls -l chbr.sh
~rwxrwxr-x 1 ronnie ronnie 46 Jul 13 15:59 /home/ronnie/chbr.sh

score 15 · Accepted Answer · answered Jul 13 '12 at 10:50

15

You make all correct, but execute the script with te full path:

$ sudo /home/ronnie/chbr.sh

answered Jul 13 '12 at 10:50

Igor Chubin

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Is there any way I can run this script at startup.? – ronnie Jul 13 '12 at 10:52
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If you run it at startup, you do not need to sudo it. Depending on your system there are different approaches (init.d, upstart, ...) – fragmentedreality Jul 13 '12 at 10:53
I just installed openbox. So, can I just add `sudo /home/ronnie/chbr.sh` to my `autostart.sh` – ronnie Jul 13 '12 at 10:55
Of course you can run the script during the startup process, but you don't need sudo for that; startup processes are started with root privileges anyway. Just add the script to `/etc/rc.local`. – Igor Chubin Jul 13 '12 at 10:55
`$ touch temp.sh` `$ sudo temp.sh` `sudo: temp.sh: command not found` Mac Os X 10.8 – Nakilon Oct 01 '13 at 16:56
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@Nakilon: `chmod +x temp.sh; sudo ./temp.sh` – Igor Chubin Oct 02 '13 at 10:00

score 3 · Answer 2 · answered Jul 13 '12 at 10:49

3

Do you run sudo /home/ronnie/chbr.sh?

With the content of the file being

setpci -s 00:02.0 F4.B=30

Or you allow user ronnie to sudo setpci without password:

ronnie ALL = (ALL) NOPASSWD: /sbin/setpci <-- or whatever path your setpci resides in.

answered Jul 13 '12 at 10:49

fragmentedreality

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score 2 · Answer 3 · answered Feb 23 '19 at 07:05

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For anyone who stumbles into this old forum. You don't need sudo to change the brightness. It can be done with the “light” program where the

light -A 5

increases brightness with 5 and

light -U 5

decreases the brightness with 5.

answered Feb 23 '19 at 07:05

Jakob Guldberg Aaes

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It *does* require sudo in my case. – m_ocean Apr 30 '22 at 12:09
Light or or your script? Well you can add your script to sudoers (there's plenty of other threads on that) but make sure to restrict writing/editing Og your file as it will otherwise become insecure. – Jakob Guldberg Aaes Apr 30 '22 at 16:17

How to give sudo access to a bash script?

3 Answers3