I have a question about command sudo.

Basically, you know, sudo allows any permitted users who enrolled in the /etc/sudoers to perform some commands specified in it.

At this point, I wonder how my default user account can use sudo.

The following is content of my /etc/sudoers file.

# 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"

# 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

As you see, my account - jwl - is not registered in that file. But I can use sudo command without any problems. How can it be possible? Is there any mechanism I don't know? If so, let me know it.

Thank you for reading.


If your account was created during installation, it will be part of the sudo group, and the sudo group is mentioned in that file (the line with %sudo). You can confirm this by running the groups command, which lists the groups your user is a member of.

  • Wow,I confirmed it with groups command and referred to /etc/passwd file. As you told, my account is member of sudo groups. Thank you for your help :) – NoFence Feb 23 '15 at 5:13

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