Ubuntu Commands and Answers
Ubuntu is free of charge, globally available and open-source Linux operating system, capable of web surfing, document creation, email read and more. This operating system is highly customizable and built on the ideas of Ubuntu Manifesto; the software should be available without any cost, the software tool should be available in the local language of the user and should be used despite any disabilities, and the freedom to customize the software according to their fit. All the popular ubuntu commands have been put together which will be handy if you want to crack an interview. Similar to other operating systems, Ubuntu has its own set of command lines at disposal to help users interact with the Linux interface. Ubuntu commands questions are common among IT sector interviews.
Most Frequently Asked Ubuntu Commands
To check the current version of Ubuntu, we have to follow these steps:
- Open the terminal
- Put the command lsb_release -a
- A message will be followed up like this:
$ lsb_release –a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 17.10.3 LTS
Release: 17.10
Codename: trusty
(The release and description numbers are an example here)
The List of common Ubuntu terminal commands.
The minimum system requirements for Ubuntu are as following:
- 2 GB RAM
- 2 GHz dual-core processor
- 25 GB of hard-drive space
- 1024x768 screen resolution VGA capable
- Either a DVD/CD drive or a USB port for the installer media
- Internet access (additional)
Follow further to get the Ubuntu command line list.
| S.no | Windows | Ubuntu |
|---|---|---|
| 1. | Users have to pay to use Windows. | Free and available as open source. |
| 2. | Supports executable files. | Does not support executable files. |
| 3. | Doesn’t support server. | Can work as a server. |
| 4. | Doesn’t support multiple desktop environment. | Supports multiple desktop environments. |
| 5. | Doesn’t has its own software manager. | It has its own software manager. |
Ubuntu is a South African ethical ideology which comes from the Xhosa and Zulu languages and roughly translates as “humanity towards others.” As the platform is based on free software and shares the belief of connectivity to all, the name “Ubuntu” is best suited for it.
Ubuntu has a long list of basic commands. Here is the list of most used ones:
- Sudo–to be used for a command that requires root permissions
- ls (list) - terminal will show you all the files and folders of the directory
- cd –Prime command that always is in use in terminal
- pwd - displays the full pathname of the current working directory
- cp - allows copying a file
- mv - allows moving a file
- rm - allows removing a specified file
- mkdir–Used to create a new directory
- history - displays all of the previous commands
- df - presents information of all mounted filesystems disk space usage
- du - shows the size of a directory and subdirectories
- free –allows us to see the amount of open space available in the system
- uname–a–Offers a wide range of necessary information regarding system
- top –displays the process utilizing the most system resources at any given time
- info –displays a manual page with precise information
Running root commands with Sudo is the most preferred way to root in Ubuntu. We can follow this process to root in Ubuntu.
- Open a terminal window using Ctrl+Alt+T
- Type the command sudo before the rest of your command
- Put the command gksudo before running a command that opens a program with a GUI
- Now simulate a root environment
- Finally, give sudo access to another user
Advance Linux interview question and suggested answers for them to be followed by freshers and experienced.
We can use the following ways to get help in the Ubuntu terminal.
- Use of –h or –help command
- Using tab completion on the Shell
- Use the help command by pressing Ctrl+ Alt+ T and then type help
- Using the man pages
- Using the info command
- Using the relevant command
Sudo or “superuser do!”used to run commands in Ubuntu with elevated privileges, which are required to perform specific administrative tasks.
The mkdir command is used in Ubuntu to create new directories. The syntax to use the mkdir command is described below:
mkdir [OPTION]... DIRECTORY.
There are different commands to access the directory in Ubuntu.
- cd /- To navigate the root directory
- cd or cd ~ - To navigate through the home directory
- cd–To navigate up one directory level
- cd -- To navigate to the previous directory
Advantages of Ubuntu
- Best for development purposes such as programming, software or web development
- Better performance due to optimized and RAM and core utilization.
- Good productivity can be achieved due to the use of explorer, theme and unlimited free applications
- Best for security purpose
- Offers a learning curve to users
Now let’s discuss a set of most asked all Ubuntu commands related interview questions and suggested answers for them for your acknowledgment. Practicing these interview questions will help you grow your knowledge regarding the Ubuntu operating system and also increases your success chance for future interviews.