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Answer :
Final answer:
su - username commands is used to switch from one user login to another in a Linux computer. Thus option B is correct.
Explanation:
To switch from one user login to another in a Linux computer, the command 'su - username' is used. The 'su' command stands for "switch user" and the hyphen (-) along with it initiates a login shell for the specified username. This ensures that the environment variables and paths are set up as they would be for the specified user, providing a seamless transition. It also loads the user's login scripts and configurations, allowing the user to work within their own environment. Therefore, the correct command to switch users in Linux is 'su - username'.
The command 'su' itself is used for switching users, but when followed by a hyphen (-) and a username, it initiates a login shell for that user. This means it loads the user's environment as though they had just logged in, including their home directory and shell configuration files. This ensures a smooth transition with all the necessary settings in place.
Using 'su - username' is particularly important for tasks that require specific user permissions or environments, such as administrative tasks. It allows the user to work within their own environment without inadvertently affecting system settings or files. Additionally, it ensures that any commands executed will be attributed to the specified user, maintaining accountability and traceability within the system logs. Therefore, the hyphen (-) in the 'su' command plays a crucial role in ensuring the proper execution of user switching in Linux systems. Thus option B is correct.
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