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I have created an alias for myuser that is

alias up='sudo apt update && sudo apt -y upgrade && sudo apt -y autoremove'

It is stored in the user's .bashrc file. I have tried to modify sudoers file inserting the following line at the end of it:

myuser ALL=(ALL) NOPASSWD: up

visudo gives a syntax error however. How can I make my alias run without the password for root?

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If you want to run all sudo commands without a password you can use this.

myuser ALL=(ALL) NOPASSWD:ALL

If you want to limit it to only a few commands you can use this.

myuser ALL=(ALL) NOPASSWD: /usr/bin/apt,/usr/bin/command
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I guess it's not working because :up is an alias, not a path to a file. Aliases are caught and expanded by the shell before being executed.

To get the behavior you want you'll have to use :

myuser ALL=(ALL) NOPASSWD: /usr/bin/apt

(Double check that it's the correct route for APT, I don't have any apt based distro handy right now).

But what you are trying to do is a disaster waiting to happen, at least if you don't ommit that " sudo apt -y autoremove". Autoremove should be used with caution and reviewing what's planning to remove, as it can remove essential packages sometimes and really mess with your system (I learned the hard way)

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