Top 150 Linux Interview Questions and Answers

The command to check profile consistency in Linux is 'saproot.sh'.

• The 'saproot.sh' command checks the consistency of SAP profiles in Linux.

• It can be run as the 'root' user or with 'sudo'.

• The output of the command shows any inconsistencies in the prof...read more

To create an archive file in LINUX, use the 'tar' command.

• Use the 'tar' command followed by the options and the name of the archive file.

• To create a compressed archive, use the 'z' option for gzip compression or 'j' option for bzip2 compression.

• To ex...read more

Echo command is used to print the input or output text on the terminal.

• Echo command is a built-in command in Linux/Unix systems.

• It is used to display a line of text/string that is passed as an argument.

• It can also be used to redirect the output of a ...read more

I have extensive knowledge of both Windows and Linux based servers.

• I am proficient in managing and configuring Windows Server operating systems.

• I have experience in setting up and maintaining Linux servers, including Ubuntu, CentOS, and Red Hat.

• I am ...read more

Use inotifywait command to monitor file changes in Linux.

• Install inotify-tools package

• Use inotifywait command with options like -m for continuous monitoring and -e for specific events

• Example: inotifywait -m /var/log/messages -e modify

• Output will show...read more

Linux boot process involves several stages including BIOS, bootloader, kernel initialization, and user space initialization.

• The process starts with the BIOS (Basic Input/Output System) which initializes hardware components.

• The bootloader (GRUB or LIL...read more

I have extensive technical knowledge in Linux and Networking, including experience with system administration, network configuration, and troubleshooting.

• Proficient in Linux operating systems such as Ubuntu, CentOS, and Red Hat

• Experience with network...read more

The maximum size of a filename in Linux is 255 bytes.

• The maximum length includes the entire path and filename.

• The limit is imposed by the file system, not the operating system.

• Some file systems, such as ext4, support longer filenames with special con...read more

chmod changes file permissions while chown changes file ownership in Linux.

• chmod is used to change the read, write, and execute permissions of a file or directory.

• chown is used to change the owner and group of a file or directory.

• chmod uses a numeric...read more

To kill a process in RHEL 7.2, use the 'kill' command followed by the process ID.

• Identify the process ID using 'ps' command

• Use 'kill' command followed by the process ID to terminate the process

• Use 'kill -9' command to force kill the process if it doe...read more

Processes are independent execution units, while threads are lightweight, share resources within a process.

• A process is an independent program in execution, while a thread is a smaller unit of a process.

• Processes have their own memory space; threads ...read more

The Find command in Linux is used to search for files and directories based on specified criteria.

• Used to search for files and directories in a specified directory

• Criteria can include file name, size, permissions, and more

• Can be combined with other c...read more

Filter command in Linux is used to filter out specific data from a file or output.

• The basic syntax of the filter command is 'command | filter'.

• Commonly used filter commands are grep, sed, awk, cut, sort, uniq, etc.

• grep is used to search for a specifi...read more

To find DNS of a website using Linux command

• Use 'nslookup' command followed by the website URL

• Alternatively, use 'dig' command followed by the website URL

• Both commands will display the DNS information of the website

Command to check httpd service status

• Use the command 'systemctl status httpd' to check the status of httpd service

• If httpd service is running, the output will show 'active (running)'

• If httpd service is not running, the output will show 'inactive (dea...read more

To check the current user in Linux terminal, you can use the 'whoami' command.

• Use the 'whoami' command to display the current user's username.

• Alternatively, you can also use the 'id' command to display information about the current user.

To check memory usage in Linux EC2 instance, use the command 'free -m'

• Open terminal or SSH into the EC2 instance

• Type 'free -m' command and press enter

• The output will show the total, used, and free memory in megabytes

• You can also use 'top' command to ...read more

Yes, I have completed Linux training and obtained certification.

• I have completed a Linux training course offered by XYZ Institute.

• I have obtained the Linux Professional Institute Certification (LPIC-1).

• I have hands-on experience working with various ...read more

To create a blank file in RHEL, you can use the 'touch' command.

• Open the terminal in RHEL.

• Use the 'touch' command followed by the desired file name to create a blank file.

• For example, to create a file named 'example.txt', you would run: touch example...read more

Shell in Linux is a command-line interpreter that allows users to interact with the operating system by executing commands.

• Shell is a program that takes commands from the keyboard and gives them to the operating system to perform.

• It can also be used ...read more

I am very comfortable with Linux-Grep etc.

• I have extensive experience working with Linux and using command line tools like grep, awk, and sed.

• I am familiar with regular expressions and can use them effectively in my work.

• I have used these tools to tr...read more

To give group and user permissions in Linux, use the chmod command.

• Use the chmod command followed by the permission code (e.g. 755) and the file or directory name.

• To give permissions to a specific user, use the chown command followed by the username ...read more

Only 4 primary partitions are created in Linux due to limitations of the MBR partitioning scheme.

• MBR partitioning scheme allows for a maximum of 4 primary partitions.

• Extended partitions can be used to create more than 4 partitions by creating logical...read more

Red Hat is a leading provider of open source software solutions, including the popular Red Hat Enterprise Linux operating system.

• Red Hat is a software company that specializes in open source solutions.

• They are known for their flagship product, Red Ha...read more

The user's password in Linux is stored in the /etc/shadow file.

• The /etc/shadow file contains the encrypted passwords for all the users on the system.

• Each line in the /etc/shadow file represents a user and their password information.

• The password field...read more

To edit an existing file on a Linux server, you can use a text editor like Vim or Nano.

• Use a text editor like Vim or Nano to open the file for editing

• Make the necessary changes to the file

• Save the changes and exit the text editor

Crontab commands are used in Linux for scheduling tasks at specific times.

• crontab -e: Edit the crontab file

• crontab -l: List the current crontab entries

• crontab -r: Remove the current crontab file

• crontab -u username: Specify the username whose crontab ...read more