Ubuntu Interview Questions and Answers

Ques 1. What is the purpose of the '/etc/apt/sources.list' file?

The '/etc/apt/sources.list' file contains a list of package repositories for APT.

Ques 2. Explain the difference between 'apt-get' and 'apt'.

'apt' is a simplified command-line interface for the APT package manager, while 'apt-get' is the traditional command-line tool.

Ques 3. How do you install a package using the 'dpkg' command?

You can install a package with the command: sudo dpkg -i package.deb

Ques 4. How do you change the ownership of a file in Ubuntu?

You can change the ownership of a file with the 'chown' command, like this: sudo chown newOwner:newGroup filename

Ques 5. What is the purpose of the '/etc/fstab' file?

The '/etc/fstab' file contains information about disk drives and partitions, and it is used by the 'mount' command.

Ques 6. Explain the purpose of the '/etc/passwd' file.

The '/etc/passwd' file contains user account information, including usernames and user IDs.

Ques 7. How do you search for a file in Ubuntu using the command line?

You can use the 'find' command to search for files. For example: find /path/to/search -name filename

Ques 8. What is the purpose of the '/etc/apt/sources.list.d/' directory?

The '/etc/apt/sources.list.d/' directory is used to store additional APT repository configuration files.

Ques 9. What is the purpose of the 'chmod' command?

The 'chmod' command is used to change the permissions of a file or directory.

Example:

chmod permissions filename

Ques 10. Explain the purpose of the 'cron' system in Ubuntu.

The 'cron' system is used for scheduling tasks to run automatically at specified intervals.

Ques 11. How do you add a user to a group in Ubuntu?

You can add a user to a group with the 'usermod' command. For example: sudo usermod -aG groupName username

Ques 12. Explain the purpose of the 'journalctl' command.

The 'journalctl' command is used to query and display messages from the journal, managed by 'systemd'.

Example:

journalctl

Ques 13. What is the purpose of the 'apt-cache' command?

The 'apt-cache' command is used to query and display information about packages in the APT cache.

Example:

apt-cache show packageName

Ques 14. What is the purpose of the 'systemctl' command?

The 'systemctl' command is used to control the 'systemd' system and service manager.

Example:

systemctl status serviceName