Which method are correct to make a passwordless program?

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1

I search about visudo and got three ideas:

user ALL=(ALL) NOPASSWD: command
user ALL=(ALL:ALL) NOPASSWD: command
user ALL=NOPASSWD: command

which one is better to make a passwordless program?

2

It depends on what you want to achieve and you did not explain it. All three will work to some extent, they differ in possible target users/groups. This is described rather extensively in man sudoers.

3

Can you explain ALL=(ALL), ALL=(ALL:ALL), ALL=NOPASSWD? I don’t know what they are doing more than I know, what I know is them can make the command passwordless.

4

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