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1. Explain the entries of /etc/fstab file?
2. What is sticky bit, how it will be useful explain with example?
Sticky bit : Sticky bit was used on executables in linux so that they would remain in the memory more time after the initial execution, hoping they would be needed in the near future. But mainly it is on folders, to imply that a file or folder created inside a stickybit enabled folder could only be deleted by the owner. A very good implementation of sticky bit is /tmp , where every user has write permission but only users who own a file can delete them.
3. How to provide access to single file to multiple users and groups with customized permissions?
4. What is SGID and SUID explain?
SUID : If setuid bit is set, when the file is executed by a user, the process will have the same rights as the owner of the file being executed.
SGID : Same as above, but inherits group privileges of the file on execution, not user privileges. Similar way when you create a file within the directory, it will inherit the group ownership of the directories.
5. / mount point usage is 99% however did not find any large files to delete, how did you clear up the / usage and bring back to normal usage?
6. how to scan for New LUN without server reboot?
7. What is zombie process, how zombie processes will impact system performance?
8. How to create single file system size more tham 3TB in size?
9. Whas is umask and how umask will help?
10. Explain crontab fileds with examples?
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