0

/etc/sudoers:

# This file MUST be edited with the 'visudo' command as root.
#
# Please consider adding local content in /etc/sudoers.d/ instead of
# directly modifying this file.
#
# See the man page for details on how to write a sudoers file.
#
Defaults        env_reset
Defaults        mail_badpass
Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"

# Host alias specification

# User alias specification

# Cmnd alias specification

# User privilege specification
root    ALL=(ALL:ALL) ALL

# Members of the admin group may gain root privileges
%admin ALL=(ALL) ALL

# Allow members of group sudo to execute any command
%sudo   ALL=(ALL:ALL) ALL

# See sudoers(5) for more information on "#include" directives:

#includedir /etc/sudoers.d

h ALL=NOPASSWD: /usr/bin/brightlight -i 20 -f /sys/class/backlight/amdgpu_bl0

But doing the command still gives me a permission error.

h@pop-os:~$ brightlight -i 20 -f /sys/class/backlight/amdgpu_bl0
brightlight: could not open "brightness" file: Permission denied

Also

h@pop-os:~$ sudo -l
Matching Defaults entries for h on pop-os:
    env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin

User h may run the following commands on pop-os:
    (ALL : ALL) ALL
    (root) NOPASSWD: /usr/bin/brightlight -i 20 -f /sys/class/backlight/amdgpu_bl0

Things I have tried:

  • Rebooting
  • Creating a file in /etc/sudoers.d/brightlight with last line of config above

EDIT: Fixed, you need to add sudo, and it won't prompt you for a password

2

Your entry in /etc/sudoers means that you can run

sudo brightlight -i 20 -f /sys/class/backlight/amdgpu_bl0

without being asked for a password. It doesn't mean you can run

brightlight -i 20 -f /sys/class/backlight/amdgpu_bl0

without sudo.

1
  • I've got a similar question here could you pop in to assist? This question came up in a search, and I've read some man pages but I want to be sure I'm doing this correctly since as you know, bad edits could lock me out.
    – BingBong
    Jan 11 '20 at 19:57

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.