Joe, a user, is unable to log in to the server and contracts the systems administrator to look into the issue.
The administrator examines the /etc/passwd file and discovers the following entry: joe:x:505:505::/home/joe:/bin/false Which of the following commands should the administrator execute to resolve the problem?
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A. B. C. D.A.
The entry in the /etc/passwd file for Joe shows that his default shell is set to /bin/false, which means he cannot log in to the server. Therefore, the system administrator needs to change Joe's default shell to a valid shell to enable him to log in to the server.
Option A: usermod "s /bin/bash joe This command is incorrect as it is missing the hyphen before the "s" option, which should be "-s". The correct command to change Joe's default shell to /bin/bash is "usermod -s /bin/bash joe". This command modifies an existing user account, so it's not suitable in this scenario where Joe already has an entry in the /etc/passwd file.
Option B: passwd "u joe This command is incorrect as it uses the "-u" option to unlock a user account, but Joe's account is not locked. Therefore, this command is not relevant to the scenario.
Option C: useradd "s /bin/bash joe This command is incorrect as it creates a new user account instead of modifying an existing one. Joe already has an entry in the /etc/passwd file, so creating a new account is not necessary.
Option D: chage "E -1 joe. This command is the correct answer. The "chage" command is used to change user password expiry information, but it also has an option to set the account expiration date. The "-E" option sets the account expiration date, and "-1" sets it to never expire. Therefore, running the command "chage -E -1 joe" will ensure that Joe's account never expires, and he will be able to log in to the server with his current password and a valid shell.
In summary, the correct command to execute to resolve Joe's log-in issue is "chage -E -1 joe".