Add office photos
i
TCS
Compare
Filter interviews by
TCS Linux and Unix System Administrator Interview Questions and Answers
Be the first one to contribute and help others!
Interview questions from similar companies
Linux and Unix System Administrator Interview Questions & Answers
IBM
Anonymous
posted on 31 Aug 2022
I applied via Walk-in and was interviewed in Mar 2022. There was 1 interview round.
(31 Questions)
- Q1. How recover a user file deleted or file /etc/passwd ?
- Ans.
To recover a deleted user file or /etc/passwd, restore from backup or use data recovery tools.
Check if a backup of the file exists and restore it
If no backup is available, use data recovery tools like extundelete or scalpel
Stop writing to the disk immediately to prevent overwriting the deleted file
Consult with a professional if necessary
- Q2. How to switch a user ?
- Ans.
To switch a user in Linux or Unix, use the 'su' command followed by the username.
Open the terminal
Type 'su' followed by the username of the user you want to switch to
Enter the password of the user when prompted
You will be switched to the specified user
- Q3. How to check a user password status for any users ?
- Ans.
To check a user password status, use the 'passwd' command with the '-S' option followed by the username.
Open the terminal or command prompt.
Type 'passwd -S
' and press Enter. The password status will be displayed, indicating if the password is locked, expired, or active.
- Q4. How to secure our system security user mangement ?
- Ans.
To secure system security user management, follow best practices such as strong passwords, regular audits, limited privileges, and multi-factor authentication.
Enforce strong password policies
Regularly audit user accounts and access permissions
Implement least privilege principle
Enable multi-factor authentication
Disable unnecessary user accounts
Regularly update and patch the system
Implement intrusion detection and preven...
- Q5. If one file move to another directory then what will change file name or other anything else ?
- Ans. Inodes number change of file , not change name or anything else . we can check it by #stat file name command .
- Q6. How we can check groups lists & assinged users to them ?
- Ans.
To check group lists and assigned users, we can use the 'getent' command in Linux and Unix systems.
Use the 'getent group' command to list all the groups and their details
To check the users assigned to a specific group, use 'getent group
' The output will display the group name, group ID, and a list of users assigned to the group
- Q7. Can we modify user password and name ?
- Ans.
Yes, as a Linux and Unix System Administrator, you can modify user passwords and names.
To modify a user's password, you can use the 'passwd' command followed by the username.
To modify a user's name, you can use the 'usermod' command followed by the username and the '-l' option to change the login name.
Make sure to have the necessary permissions to modify user information.
- Q8. How to check that all port are connected to your computers and power supply or system configuration ?
- Ans.
To check all connected ports and power supply, use commands like lsusb, lspci, lshw, and check power cables and system configuration.
Use lsusb command to list USB devices connected to the computer
Use lspci command to list PCI devices connected to the computer
Use lshw command to list detailed hardware information
Physically check power cables and connections
Verify system configuration settings
- Q9. How we can putty frienly session ?
- Q10. How to know that in which directory we are sitting presently ?
- Ans.
To know the current directory in Linux/Unix, use the 'pwd' command.
Type 'pwd' in the terminal and press enter.
The output will show the full path of the current directory.
Alternatively, you can use 'echo $PWD' to display the current directory path.
The command 'ls' can also be used to list the contents of the current directory.
- Q11. #pwd for present working direcory.
- Ans.
The command to display the present working directory in Linux/Unix is 'pwd'.
The 'pwd' command stands for 'print working directory'.
It displays the absolute path of the current working directory.
The output of 'pwd' does not contain any trailing slashes.
- Q12. How we scan a LUN & check the wwn number ?
- Ans.
To scan a LUN and check the wwn number, use the 'multipath' command.
Run 'multipath -ll' to list all the available LUNs and their wwn numbers.
To scan for new LUNs, run 'echo '- - -' > /sys/class/scsi_host/hostX/scan' (replace X with the appropriate host number).
Use 'multipath -v3' for verbose output and troubleshooting.
Ensure that the necessary drivers and modules are loaded for the storage device.
Check the system logs ...
- Q13. #devfsadm & #fcinfo hba-port are used for this.
- Q14. How to check data set & mount point information in human readable format ?
- Ans.
To check data set & mount point info in human readable format, use the 'df' command.
Open the terminal and type 'df -h' to display the information in human-readable format.
The 'df' command shows the file system disk space usage, including the mount point and file system type.
The '-h' option displays the sizes in a human-readable format, such as 'K' for kilobytes, 'M' for megabytes, and 'G' for gigabytes.
You can also use...
- Q15. By using #df -h command . meaning disk free.
- Q16. How can we create a mirror pool & what does it require for ?
- Ans.
A mirror pool is a storage configuration that duplicates data across multiple drives for redundancy and improved performance.
A mirror pool is created using software RAID (Redundant Array of Independent Disks) technology.
It requires at least two drives to create a mirror pool.
The data written to one drive is automatically duplicated to the other drive in real-time.
If one drive fails, the data can still be accessed from ...
- Q17. How to destroy a pool ?
- Ans.
To destroy a pool in Linux or Unix, use the 'zpool destroy' command.
Open the terminal or command prompt.
Use the 'zpool destroy' command followed by the name of the pool to be destroyed.
Confirm the destruction by typing 'y' or 'yes' when prompted.
The pool and all its associated data will be permanently deleted.
- Q18. How to replace a disk from pool ?
- Ans.
To replace a disk from a pool, you need to remove the faulty disk and add a new disk to the pool.
Identify the faulty disk using disk monitoring tools or error messages
Remove the faulty disk from the pool using the appropriate command or tool
Physically replace the faulty disk with a new disk
Add the new disk to the pool using the appropriate command or tool
Verify the disk replacement and ensure data integrity
- Q19. How we check all zpool status ?
- Ans.
To check all zpool status, use the 'zpool status' command.
Open the terminal or command prompt.
Type 'zpool status' and press Enter.
The command will display the status of all zpools on the system.
You can also use additional options like '-v' for more detailed information.
- Q20. How can we check all disk information ?
- Ans.
To check all disk information in Linux and Unix systems, you can use the 'df' command.
Use the 'df' command to display disk space usage information
Add the '-h' option to display sizes in a more human-readable format
Use the '-T' option to display the filesystem type
Use the '-i' option to display inode information
Combine options as needed to get the desired output
- Q21. How we can check all information destroy pool & get back them ?
- Ans.
To check all information destroy pool & get back them, we can use ZFS snapshots and clones.
ZFS snapshots and clones can be used to recover data from a destroyed pool.
Snapshots capture the state of the pool at a specific point in time.
Clones can be created from snapshots and mounted as a separate file system.
Data can be copied from the clone to the new pool.
It is important to regularly create snapshots to ensure data ca
- Q22. For this we require 2 commands , first #zpool import -D to get all information about destroys pools and to get back them we use #zpool import -D pool name .
- Q23. How can we attach &detach disk from a normal and mirror pool ?
- Ans.
To attach & detach disk from normal and mirror pool, use zpool attach and zpool detach commands.
To attach a disk to a normal pool, use 'zpool attach poolname existing_device new_device'
To detach a disk from a normal pool, use 'zpool detach poolname device'
To attach a disk to a mirror pool, use 'zpool attach poolname existing_device mirror_device'
To detach a disk from a mirror pool, use 'zpool detach poolname mirror_dev
- Q24. #zpool attach poolname old disk new disk & # zpool detach poolname diskid both command are required for particular action.
- Q25. Tell all process of patch management by stepwise ?
- Ans.
Patch management process involves identifying, testing, deploying, and verifying patches.
Identify vulnerabilities and available patches
Test patches in a non-production environment
Deploy patches to production systems
Verify successful patch installation and functionality
Monitor for any issues or new vulnerabilities
Repeat the process regularly
Use automation tools for efficiency
- Q26. First of all we require two pkg download from oracle support or Linux support - base repo and SRU in our system & we will require a software winscp for copy pkg desktop to server . we will open winscp and...
- Q27. How many run level are in Saloris and Linux
- Ans.
Saloris does not exist. Linux has 7 run levels.
Saloris is not a known operating system
Linux has 7 run levels numbered from 0 to 6
Each run level has a specific set of services and daemons that are started or stopped
Run level 0 is used for system halt
Run level 1 is used for single user mode
Run level 2 is used for multi-user mode without networking
Run level 3 is used for multi-user mode with networking
Run level 4 is not u...
- Q28. In Saloris 5 & Linux 6 have run level.
- Q29. How we reboot system ?
- Ans.
To reboot a system, use the 'reboot' command or the 'shutdown' command with the '-r' option.
Use the 'reboot' command to immediately reboot the system
Use the 'shutdown -r' command to schedule a reboot at a specific time
Ensure you have the necessary permissions to reboot the system
- Q30. How to activate Boot Environment back up ?
- Ans.
To activate Boot Environment back up, use the beadm command.
Use the beadm command with the activate option followed by the name of the Boot Environment.
For example, to activate the Boot Environment named 'BE1', use the command 'beadm activate BE1'.
This will make the Boot Environment the default one at the next system reboot.
- Q31. We use for this action #beadm activate bename
Interview Preparation Tips
- LDOM
- zfs snapshot
- crontab
- Service management
- Process Management
- NFS
Skills evaluated in this interview
Linux System Administrator Interview Questions & Answers
LTIMindtree
Anonymous
posted on 19 Dec 2024
Selected
I applied via campus placement at NBKR Institute of Science and Technology, Vidyanagar and was interviewed in Nov 2024. There were 4 interview rounds.
It was about an aptitude test which is on English grammar and athematic reasoning.
The Fibonacci series can be applied to alphabets, and the same should be printed.
(2 Questions)
- Q1. Fibonancci series to print the alphabets?
- Q2. Print the numbers in descending order 123456?
- Ans.
Print numbers in descending order 123456
Create an array of strings containing the numbers 1 to 6
Sort the array in descending order
Print the sorted array
(3 Questions)
- Q1. Why are you choosing our organization?
- Ans.
I am choosing your organization because of its reputation for innovation, strong company culture, and opportunities for growth.
Reputation for innovation in the industry
Strong company culture that values employee development
Opportunities for growth and advancement within the organization
- Q2. Are you open to relocation?
- Ans.
Yes, I am open to relocation for the right opportunity.
I am willing to relocate for the right job opportunity that aligns with my career goals.
I am open to exploring new locations and experiencing different cultures.
I understand that relocation may be necessary for career advancement and personal growth.
- Q3. Are you comfortable with rotational shifts?
- Ans.
Yes, I am comfortable with rotational shifts as I have prior experience working in such shifts.
I have previous experience working in rotational shifts at my previous job.
I am adaptable and can easily adjust my schedule to accommodate rotational shifts.
I understand the importance of being available during different shifts to ensure smooth operations.
I am willing to work in rotational shifts to support the team and meet
Interview Preparation Tips
I applied via Naukri.com and was interviewed in Sep 2024. There were 2 interview rounds.
(3 Questions)
- Q1. If a server patched with new kernel update after reboot server came up with old kernel only. How will you troubleshoot it ?
- Ans.
To troubleshoot a server that booted up with the old kernel after a new kernel update, check the bootloader configuration, verify the kernel installation, and review the update process.
Check the bootloader configuration to ensure it is pointing to the correct kernel version.
Verify the kernel installation to see if the new kernel was successfully installed.
Review the update process to identify any errors or issues that ...
- Q2. What are the various commands to check the CPU , Memory utilization in Linux server ?
- Ans.
Various commands to check CPU and Memory utilization in Linux server.
To check CPU utilization: top, mpstat, sar
To check Memory utilization: free, vmstat, sar -r
- Q3. How will you create and add new disk to the system using LVM ? Write the commands of the process.
- Ans.
To add a new disk to the system using LVM, you need to initialize the disk, create a physical volume, extend the volume group, and finally extend the logical volume.
Initialize the disk using fdisk or parted command
Create a physical volume using pvcreate command
Extend the volume group using vgextend command
Extend the logical volume using lvextend command
Resize the filesystem using resize2fs or xfs_growfs command
(2 Questions)
- Q1. Tell me about yourself
- Ans.
Experienced Linux Administrator with a passion for troubleshooting and optimizing systems.
Over 5 years of experience managing Linux servers in a corporate environment
Skilled in shell scripting, server configuration, and system monitoring tools like Nagios
Strong problem-solving skills and ability to work well under pressure
Certified in Red Hat Enterprise Linux (RHCE)
Passionate about staying up-to-date with the latest te
- Q2. Can you let us know the skills other than mentioned skills in resume?
- Ans.
Some additional skills I possess include scripting languages, troubleshooting abilities, and strong communication skills.
Proficiency in scripting languages such as Python, Bash, or Perl can be beneficial for automating tasks and improving efficiency.
Strong troubleshooting abilities are essential for quickly identifying and resolving issues that may arise in a Linux environment.
Effective communication skills are importa...
Skills evaluated in this interview
I applied via Approached by Company and was interviewed in Nov 2024. There was 1 interview round.
(2 Questions)
- Q1. How can I grant SFTP access exclusively to the user David?
- Ans.
Grant SFTP access exclusively to user David
Create a new group specifically for David, e.g. 'davidgroup'
Set the ChrootDirectory in the SSH configuration file to restrict David's access to a specific directory
Add David to the 'davidgroup' and configure the necessary permissions for SFTP access
- Q2. How can a user be locked out after 6 unsuccessful password attempts for a duration of 30 minutes?
- Ans.
To lock a user out after 6 unsuccessful password attempts for 30 minutes, modify the PAM configuration file.
Edit the PAM configuration file (/etc/pam.d/common-auth) to include the 'pam_tally2' module.
Set the 'deny' option in the 'pam_tally2' module to lock the user out after 6 failed attempts.
Specify the 'unlock_time' option in the 'pam_tally2' module to set the duration of the lockout period to 30 minutes.
Example: aut
I applied via Approached by Company
(2 Questions)
- Q1. How to configure NFS
- Ans.
NFS can be configured by setting up the NFS server, exporting directories, and configuring client access.
Install NFS server package on the server
Edit /etc/exports file to specify directories to be shared
Restart NFS service to apply changes
Configure client access by mounting NFS shares on client machines
- Q2. How to perform patching
- Ans.
Patching involves applying updates to software to fix vulnerabilities and improve performance.
Identify the software that needs to be patched
Download the necessary patches from the vendor's website
Test the patches in a non-production environment before applying them to production systems
Schedule a maintenance window to apply the patches
Apply the patches using tools like yum, apt-get, or Windows Update
Verify that the pat...
(2 Questions)
- Q1. Salary discussion
- Q2. Location discussion
Skills evaluated in this interview
The questions were very relevant.
(2 Questions)
- Q1. What are the computer languages you know?
- Ans.
I am proficient in languages like Python, Bash, and SQL.
Python
Bash
SQL
- Q2. Write a code in Java?
- Ans.
A Java code snippet showcasing basic syntax and functionality.
Declare a class with a main method
Create variables and assign values
Use control structures like if-else or loops
Print output using System.out.println()
(2 Questions)
- Q1. Do you opt for relocation?
- Q2. Where do want to see yourself in next 5 years?
Interview Preparation Tips
Skills evaluated in this interview
(2 Questions)
- Q1. Why want to work in Tech m
- Q2. Why want to work in Tech M
Interview Preparation Tips
They hired employees for Noida office and send them to other location also do not give relocation if person change his/her location. Gratuity bonus , they give only 20,000 per employees after depending 5 years in name of bonus
I applied via Naukri.com and was interviewed in Apr 2024. There was 1 interview round.
(3 Questions)
- Q1. Tell me about yourself
- Ans. My name is sumanth I'm from eluru and my graduation B. Tech mechanical from JNTUK university
- Q2. What is your strength and Weekness
- Ans. My strength - creativity, flexibility, focused My weekends -hard skills, saying no and shy
- Q3. Why should we hire u
- Ans. Because I'm hard worker who wants to help your company succeed
Interview Preparation Tips
- Redhat Linux
vinay k
(1 Question)
- Q1. How to scheduled cron job
- Ans.
To schedule a cron job, use the crontab command to edit the cron table file.
Use the crontab -e command to open the cron table file for editing
Add a new line to the file with the schedule timing and the command to be executed
Save and exit the file to schedule the cron job
(1 Question)
- Q1. What is sticky bit
- Ans.
Sticky bit is a permission in Unix/Linux that allows only the owner of a file to delete or rename it.
Sticky bit is represented by a 't' in the permissions of a file or directory.
When the sticky bit is set on a directory, only the owner of a file within that directory can delete or rename the file.
Commonly used on directories like /tmp to prevent users from deleting each other's files.
Example: chmod +t directory_name
(1 Question)
- Q1. Tell me about yourself and salary discussion
Skills evaluated in this interview
Selected
I applied via Referral and was interviewed before Sep 2022. There were 2 interview rounds.
(2 Questions)
- Q1. How to check Kernel and OS Version, How to change file permissions, Whar are the default permissions of few files, In which file user id and password stored, Network configuration stored in which file, How...
- Ans.
To check Kernel and OS Version, change file permissions, view default permissions of files, locate user id and password file, find network configuration file, and filter keywords.
To check Kernel and OS Version: Use 'uname -a' command
To change file permissions: Use 'chmod' command followed by permission code and file name
Default permissions of few files: For example, /etc/passwd has 644 permissions
User id and password s...
- Q2. What is LVM, Explain LVM Architecture, What is Raid, What is the booting process of RHEL, How to manage failed unmount or mount, What are the issues you have faced in working with Linux Servers, What is sp...
- Ans.
LVM is Logical Volume Manager used for managing disk space, RAID is Redundant Array of Independent Disks for data protection, RHEL boot process involves BIOS, GRUB, kernel loading, and init process.
LVM allows for dynamic resizing of logical volumes without downtime.
RAID combines multiple disks for data redundancy or performance improvement.
RHEL boot process involves BIOS POST, GRUB bootloader, kernel loading, and init ...
Interview Preparation Tips
Skills evaluated in this interview
Tell us how to improve this page.
TCS Interviews By Designations
- TCS System Engineer Interview Questions
- TCS Software Developer Interview Questions
- TCS Software Engineer Interview Questions
- TCS Assistant System Engineer Interview Questions
- TCS Assistant System Engineer Trainee Interview Questions
- TCS IT Analyst Interview Questions
- TCS Ninja Interview Questions
- TCS Java Developer Interview Questions
- Show more
Interview Questions for Popular Designations
- Linux Administrator Interview Questions
- Linux System Administrator Interview Questions
- Linux Support Engineer Interview Questions
- Senior Linux Administrator Interview Questions
- Senior Linux System Administrator Interview Questions
- Linux Server Administrator Interview Questions
- Linux Engineer Interview Questions
- Linux System Engineer Interview Questions
- Show more
Interview Questions from Similar Companies
Fast track your campus placements
|
System Engineer
1.1L
salaries
|  ₹1 L/yr - ₹9 L/yr |
|
IT Analyst
67.6k
salaries
| ₹5.1 L/yr - ₹15.9 L/yr |
|
AST Consultant
51.3k
salaries
| ₹8 L/yr - ₹25 L/yr |
|
Assistant System Engineer
29.9k
salaries
| ₹2.2 L/yr - ₹5.6 L/yr |
|
Associate Consultant
28.8k
salaries
| ₹8.9 L/yr - ₹32 L/yr |
Amazon
Wipro
Infosys
Accenture
- Home >
- Interviews >
- TCS Interview Questions >
- TCS Linux and Unix System Administrator Interview Questions
