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1. What is Linux?<\/h3>\n
Linux<\/strong> is a free and open-source operating system<\/strong> (OS) based on Unix<\/strong>. It acts as a bridge between the hardware of a computer and the software you run. It manages system resources and allows you to interact with your machine through a user interface (usually a command line or GUI).<\/p>\n The command to list files in a directory is:<\/strong><\/p>\n ls (in Unix\/Linux\/macOS) These commands display the names of files and folders in the current directory.<\/p>\n To view hidden files<\/strong> in Linux, you can use the terminal<\/strong> or a file manager GUI<\/strong>, depending on your environment.<\/p>\n \ud83d\udcc1 Using Terminal (Command Line): To list all files including hidden ones, use: ls -a<\/p>\n For a detailed list with permissions, ownership, etc.: ls -la<\/p>\n \ud83d\udda5\ufe0f Using GUI File Manager:<\/strong> GNOME (Ubuntu, etc.):<\/strong><\/p>\n Press Ctrl + H to toggle hidden files.<\/p>\n KDE (Dolphin):<\/strong><\/p>\n Press Alt + . (dot), or go to View > Show Hidden Files.<\/p>\n XFCE (Thunar):<\/strong><\/p>\n Press Ctrl + H.<\/p>\n The pwd command stands for “print working directory<\/strong>.” \ud83d\udd0d Purpose<\/strong>: Shows your current location in the filesystem.<\/p>\n<\/li>\n \ud83e\udded Useful for<\/strong>: Navigation, scripting, or verifying your directory path.<\/p>\n<\/li>\n<\/ul>\n The cd command stands for “change directory”<\/strong>. It is used in command-line interfaces (like Command Prompt in Windows, Terminal in macOS\/Linux) to navigate between directories (folders)<\/strong> in your file system.<\/p>\n It\u2019s case-sensitive on Linux\/macOS<\/strong>, but not on Windows<\/strong>.<\/p>\n<\/li>\n To view contents of the current directory, use:<\/p>\n In Linux, there are several ways to create a new file. Here are the most common methods:<\/p>\n Using the Creates an empty file named If the file already exists, it updates the timestamp.<\/p>\n<\/li>\n<\/ul>\n Using the Creates a file and writes “Hello World” to it.<\/p>\n<\/li>\n Overwrites the file if it already exists.<\/p>\n<\/li>\n<\/ul>\n Using the Allows you to type content directly.<\/p>\n<\/li>\n Press Using the or<\/p>\n Opens a text editor to create and edit the file.<\/p>\n<\/li>\n<\/ul>\n Using the Creates an empty file or truncates an existing one.<\/p>\n<\/li>\n<\/ul>\n To create a new directory (also called a folder), the method depends on the operating system or the programming language you’re using.<\/span><\/p>\n Linux (via Terminal):<\/strong><\/p>\n The Basic usage:<\/strong><\/p>\n This deletes the file named To copy a file from one location to another, the method depends on the programming language or tool<\/strong> you’re using.<\/p>\n In Linux (Terminal):<\/strong><\/p>\n To <\/span>move or rename a file<\/strong> in most programming languages or operating systems, you essentially <\/span>change its path or name.<\/strong><\/p>\n In Linux Terminal<\/strong><\/p>\n Rename a file<\/strong>:<\/p>\n Move a file<\/strong>:<\/p>\n Move and rename at the same time<\/strong>:<\/p>\n Use Use Use It reads and displays the content of a file.<\/p>\n Use Use Use Use Use Use Displays real-time system processes and usage.<\/p>\n Use 2. What is the command to list files in a directory?<\/h3>\n
\ndir (in Windows Command Prompt)<\/p>\n3. How do you view hidden files in Linux?<\/h3>\n
\nHidden files in Linux start with a dot (.), like .bashrc, .gitignore, etc.<\/p>\n\n
\nIf you’re using a desktop environment (like GNOME, KDE, XFCE, etc.):<\/p>\n4. What does the pwd command do?<\/h3>\n
\nIt is used in Unix\/Linux\/macOS terminals (and other command-line interfaces) to display the full path of the current working directory.<\/p>\n\n
5. What is cd used for?<\/h3>\n
\n
\n
ls<\/code> (Linux\/macOS)<\/p>\n<\/li>\ndir<\/code> (Windows)<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n6. How to create a new file in Linux?<\/h3>\n
touch<\/code> command<\/strong><\/p>\n<span class="hljs-built_in">touch<\/span> filename.txt
\n<\/code><\/div>\n<\/div>\n\n
filename.txt<\/code>.<\/p>\n<\/li>\necho<\/code> command<\/strong><\/p>\n<span class="hljs-built_in">echo<\/span> <span class="hljs-string">"Hello World"<\/span> > filename.txt
\n<\/code><\/div>\n<\/div>\n\n
cat<\/code> command<\/strong><\/p>\n<span class="hljs-built_in">cat<\/span> > filename.txt
\n<\/code><\/div>\n<\/div>\n\n
Ctrl + D<\/code> to save and exit.<\/p>\n<\/li>\n<\/ul>\nnano<\/code> or vi<\/code> editor<\/strong><\/p>\nnano filename.txt
\n<\/code><\/div>\n<\/div>\nvi filename.txt
\n<\/code><\/div>\n<\/div>\n\n
> (redirection)<\/code> operator<\/strong><\/p>\n> filename.txt
\n<\/code><\/div>\n<\/div>\n\n
7. How do you create a new directory?<\/h3>\n
<span class="hljs-built_in">mkdir<\/span> foldername<\/code><\/div>\n<\/div>\n8. What is rm used for?<\/h3>\n
rm<\/code> command is used in Unix\/Linux systems to remove (delete) files and directories<\/strong>.<\/p>\n<span class="hljs-built_in">rm<\/span> filename
\n<\/code><\/div>\n<\/div>\nfilename<\/code>.<\/p>\n9. How to copy a file from one location to another?<\/h3>\n
<span class="hljs-built_in">cp<\/span> \/home\/user\/source\/file.txt \/home\/user\/destination\/file.txt<\/code><\/div>\n<\/div>\n10. How to move or rename a file?<\/h3>\n
\n
<span class="hljs-built_in">mv<\/span> old_filename.txt new_filename.txt
\n<\/code><\/div>\n<\/div>\n<\/li>\n<span class="hljs-built_in">mv<\/span> file.txt \/new\/folder\/path\/
\n<\/code><\/div>\n<\/div>\n<\/li>\n<span class="hljs-built_in">mv<\/span> file.txt \/new\/folder\/newname.txt
\n<\/code><\/div>\n<\/div>\n<\/li>\n<\/ul>\n<\/div>\n\ud83d\udccc Interview Questions on Linux Commands for File & Directory Management<\/strong><\/h2>\n
11. How do you find the size of a file?<\/h3>\n
du -sh filename<\/code>.<\/p>\n12. How to see disk usage in Linux?<\/h3>\n
df -h<\/code> to display disk space in a human-readable format.<\/p>\n13. How to search for a file in Linux?<\/h3>\n
find \/path -name filename<\/code>.<\/p>\n14. What does the cat command do?<\/h3>\n
15. How to combine and view multiple files?<\/h3>\n
cat file1 file2 > merged.txt<\/code>.<\/p>\n\u2705 Linux Commands Interview Questions and Answers \u2013 User and Permission Handling<\/h2>\n
16. How to add a new user?<\/h3>\n
adduser username<\/code>.<\/p>\n17. How to switch users in Linux?<\/h3>\n
su - username<\/code>.<\/p>\n18. How to give executable permission to a file?<\/h3>\n
chmod +x filename<\/code>.<\/p>\n19. What is the command to change file ownership?<\/h3>\n
chown user:group filename<\/code>.<\/p>\n20. How do you check current user?<\/h3>\n
whoami<\/code>.<\/p>\n\ud83d\udd0d Linux Commands Interview Questions for Freshers \u2013 System Monitoring<\/h2>\n
21. What is top used for?<\/h3>\n
22. How do you kill a process?<\/h3>\n
kill PID<\/code> or