root user in ubuntu linux
In Ubuntu, you can check the status of the root account (whether it's enabled or disabled) by examining the password hash entry for the root user in the /etc/shadow file. If the root account is enabled, there will be a password hash entry for the root user in the /etc/shadow file. If it's disabled, the password hash entry will typically start with a special character, such as !, which indicates that the account is locked.
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