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NEW QUESTION # 126
A Linux administrator wants to add a user to the Docker group without changing their primary group. Which of the following commands should the administrator use to complete this task?
Answer: B
Explanation:
The usermod -aG command appends (-a) the user to a supplementary group (-G) without changing their primary group. This is the correct way to add a user to the docker group.
NEW QUESTION # 127
An administrator thinks that the user Joe may be running an unauthorized process on a Linux server. Which of the following commands should the administrator run to confirm this idea?
Answer: D
Explanation:
top -u Joe filters the process display to only show processes owned by user Joe, allowing the administrator to see if Joe is running any unauthorized processes.
NEW QUESTION # 128
An administrator needs to verify the user ID, home directory, and assigned shell for the user named "accounting." Which of the following commands should the administrator use to retrieve this information?
Answer: B
Explanation:
The getent passwd accounting command retrieves the user's entry from the system's password database, showing fields such as username, UID, GID, home directory, and assigned shell.
NEW QUESTION # 129
A systems administrator is configuring new Linux systems and needs to enable passwordless authentication between two of the servers. Which of the following commands should the administrator use?
Answer: D
Explanation:
This command generates an SSH key pair and securely copies the public key to the remote server, enabling passwordless authentication by allowing key-based SSH login between the systems.
NEW QUESTION # 130
Which of the following commands can be used to display real-time running processes on a Linux system?
Answer: C
Explanation:
The correct answer is B. top because it provides a dynamic, real-time view of running processes and system resource usage. The top command is an essential Linux system monitoring utility that continuously updates information about CPU usage, memory consumption, running processes, load averages, and system uptime. It is widely used by system administrators for performance monitoring and troubleshooting.
When executed, top displays a full-screen interface showing active processes sorted by resource usage (typically CPU by default). It updates at regular intervals, allowing administrators to observe changes in real time. Additionally, it offers interactive features such as sorting processes, killing processes, and filtering output, which enhances system management capabilities.
Option A (ps) is incorrect because although it lists running processes, it provides only a snapshot at a specific moment in time. It does not update dynamically unless repeatedly executed or combined with other tools.
Option C (df) is incorrect because it displays disk space usage of filesystems, not running processes.
Option D (free) is incorrect because it shows memory usage statistics, including total, used, and available memory, but does not display process-level activity.
From a Linux+ perspective, understanding tools like top is crucial under System Management objectives. It enables administrators to monitor system health, identify resource-intensive processes, and take corrective actions when necessary. Real-time monitoring is particularly important in production environments where performance issues must be diagnosed and resolved quickly.
NEW QUESTION # 131
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