How to Run ‘sudo’ Command Without Entering a Password in Linux

In case you are running Linux on a machine that you normally use alone, say on a laptop, entering a password each time you invoke sudo can become so boring in the long run. Therefore, in this guide, we will describe how to configure sudo command to run without entering a password.

This setting is done in the /etc/sudoers file, which drives sudoers to use default security policy plugin for the sudo command; under the user privilege specification section.

Important: In the sudeors file, the authenticate parameter which is turned on by default is used for authentication purposes. If it is set, users must authenticate themselves via a password (or other means of authentication) before they run commands with sudo.

However, this default value may be overridden using the NOPASSWD (require no password when user invokes sudo command) tag.

The syntax to configure user privileges is as follows:

user_list host_list=effective_user_list tag_list command_list


  1. user_list – list of users or a user alias that has already been set.
  2. host_list – list of hosts or a host alias on which users can run sudo.
  3. effective_user_list – list of users they must be running as or a run as alias.
  4. tag_list – list of tags such as NOPASSWD.
  5. command_list – list of commands or a command alias to be run by user(s) using sudo.

To allow a user (aaronkilik in the example below) to run all commands using sudo without a password, open the sudoers file:

$ sudo visudo

And add the following line:

aaronkilik ALL=(ALL) NOPASSWD: ALL

For the case of a group, use the % character before the group name as follows; this means that all member of the sys group will run all commands using sudo without a password.


To permit a user to run a given command (/bin/kill) using sudo without a password, add the following line:

aaronkilik ALL=(ALL) NOPASSWD: /bin/kill

The line below will enable member of the sys group to run the commands: /bin/kill, /bin/rm using sudo without a password:

%sys ALL=(ALL) NOPASSWD: /bin/kill, /bin/rm
Run sudo Without Password

Run sudo Without Password

For more sudo configuration and additional usage options, read our articles that describes more examples:

  1. 10 Useful Sudoers Configurations for Setting ‘sudo’ in Linux
  2. Let Sudo Insult You When You Enter Incorrect Password
  3. How to Keep ‘sudo’ Password Timeout Session Longer in Linux

In this article, we described how to configure sudo command to run without entering a password. Do not forget to offer us your thoughts about this guide or other useful sudeors configurations for Linux system administrators all in the comments.

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Aaron Kili

Aaron Kili is a Linux and F.O.S.S enthusiast, an upcoming Linux SysAdmin, web developer, and currently a content creator for TecMint who loves working with computers and strongly believes in sharing knowledge.

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11 Responses

  1. Madhusudhan Kasula says:

    Alternately you can use python pudo package:


    $ sudo -H pip3 install pudo # you can install using pip2 also

    Below is the code snippet for using in python automation for running commands under root privilege::

        user$ python3 # or python2
        >>> import pudo
        >>> (ret, out) ='ls', '/root')) # or'ls /root')
        >>> print(ret)
        >>> 0
        >>> print(out)
        >>> b'Desktop\nDownloads\nPictures\nMusic\n'

    Below is the cmd example for running commands under root privilege

        user$ pudo ls /root
        Desktop  Downloads  Pictures  Music
  2. Hubo says:

    Hi,When I opened the sudo.conf, I find a default record, “root ALL=(ALL:ALL) ALL“, my question is what’s the meaning of the third ALL, Thanks.

    • Aaron Kili says:


      The third ALL refers to effective groups, in this line, it means user root can run commands as all groups.

      • Hubo says:

        Follow my understanding, the syntax to add a record is ” =( [, …]:[ ,…]) “, is it right, Thanks.

        • Hubo says:

          Sorry, some mistakes have occured, the syntax to add a record , for example, “root ALL=(user1, user2: group1, group2) NOPASSWD: ALL”, is it right, Thanks.

          • Aaron Kili says:


            Yap, according to the sudoers man page, which explains that, “Multiple users and groups may be present in a Runas_Spec(run as user or group), in which case the user may select any combination of users and groups.

            In this example:

            aaronkilik ALL = (root, bin : operator, system) ALL

            The user aaronkilik may run any command as either user root or bin, optionally setting the group to operator or system. ”

            For additional info, go through the sudoers man page:
            man sudoers

  3. Graeme Moffat says:

    I used '' around ‘username’, which was stripped out.

    That should be –
    Defaults:username !authenticate

  4. Graeme Moffat says:

    You can also add:
    Defaults: !authenticate

  5. BasketCase says:

    Instead of configuring sudo to not require authentication at all you can setup pam_ssh_agent_auth to have it authenticate you by your ssh key.

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