Inspirisys Solutions Limited (a CAC Holdings Group Company)

***Linux Admin Interview Questions*** Q1. How to set password for a user that never expire? Q2. Why /etc/passwd and /etc/shadow file cannot be merged ? Q3. How we can list all files opened by particular process? Q4. We are unable to unmount a filesystem.What can be the possible reason Q5. What can be the reason if a server is taking more time after reboot? Q6. We are not able to create new files in a partition. We have enough disk space and permissions. What can be the possible reason? Q7. How to check kernel routing information? Q8. How to set sticky bit and different b/w small 's' and capital 'S'? Q9. which file is used to specify default gateway? Q10. How to switch between different run-levels? Q11. What is NFS ? How to configure and what port is uses? Q12. What is nice and renice value. How to set them for a particular process. Q13. Difference between FTP and TFTP? Q14. How to extend logical volume size in Linux ? Q15. How will you rollback packages after patching ? Q16. What is rsync? tell us the command and also how it is different from sop? Q17. How to reduce the size of logical volume? Filesystem reduction can be happened online or not ? Q18. How to set line no. in vim? Q19. Define each field of /etc/fstab file? Q20. Difference between soft link and hard link? Can we create a hard link across filesystems? Q21. How to check a port is listening or not? Q22. Difference between df and du command? Q23. What is journaling? Difference between ext2 and ext fs? Q24. Define boot process step by step ? Q25. What are Run-levels? Q26. what is meaning of PCPU and JCPU in w command output? Q27. What is load average? and how it is calculated ? Q28. What happen when you type a url in browser and hit enter? Q29. Diff between RPM and YUM? How to check package is installed or not? Q30. What is ACL? Why we need it and how to check or set ACL over a file or directory? Q31. What is inode and what things it stored? Q32. Can we schedule a 2 sec task in crontab ? Q33. In a production env if a server rebooted itself, So how would you check whether it is done by any other user on system or it rebooted automatically. Q34. Which command is used to set user password expiry date? Q35. How to extract a single file from tar archive? Q36. Command to check memory usage ? Q37. Command to check the kernel version and architecture of a Linux server Q38. How to search text within multiple files ? Q39. what is atime, mtime and ctime? How we can take advantage of them? Q40. How to delete log files which are 30 days old ?

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