TestOut Linux Pro Practice Test 2025 – All-in-One Guide to Master Your Certification!

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Which of the following shells is NOT typically listed in the /etc/shells file?

/bin/sh

/bin/bash

/bin/ksh

/sbin/nologin

The /etc/shells file contains a list of valid login shells available on the system. This file is essential for defining which shells users can use for their login sessions. Common shells, such as /bin/sh, /bin/bash, and /bin/ksh, are interactive command-line interpreters, and they are typically listed in the /etc/shells file because they are intended for user logins and interactive use.

In contrast, /sbin/nologin serves a different purpose. It is not a shell per se; instead, it is a program that is used to prevent a user from logging into the system. When set as a user's shell, it will deny the user access when they attempt to log in, usually displaying a message indicating that logins are not permitted. Since its primary function is to block access rather than provide an interactive shell session, it is not included in the /etc/shells file. This distinction is what makes /sbin/nologin the correct answer.

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