passwd

How do I change user password using a shell script under FreeBSD operating systems?

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I use sudo to provide permissions and command execution rights to other users under UNIX and Linux operating systems. However, I noticed something strange about sudo. When executing sudo, it will prompt for the user’s password the first time, but sudo no longer requires a password anymore when re-executing it. Why? Is this is a security risk?

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Q. Can you explain /etc/passwd file format for Linux and UNIX operating systems?

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