Linux admin Interview Questions
1.What
is difference between Hard Link and Soft Link?
ANS:
In Hard Link a new hard link is created to reference the same file. Means new
file is created which point to the same reference file. And in Soft Link a link
is created like as a shortcut.
2.Can we change port number of ssh. If yes, then to how?
2.Can we change port number of ssh. If yes, then to how?
ANS:
Yes, we can change port number of ssh. Default port number of ssh is 22.
To change port number of ssh from 22 to 2222 there have a
need to configure following file.
vim
/etc/ssh/sshd_config In above file search
the line that specifies the port number. Remove # sign before that line.
Insert number 2222 with replace to 22. Then reload the firewall
and restart the sshd service.3.What is default permission of file and directory? ANS: File default permission is 664 Directory default permission is 7754.What is difference between YUM and RPM?ANS: YUM is a Yellowdog Update Manager which is used to resolve dependencies. RPM does not resolve dependencies.5.What is LVM? Why LVM is used?
ANS: Learn LVM in more details
6.What is difference between ps and Top command.ANS: Both Top and ps commands are used to see status of processes. Top command shows dynamic view of systems processes. In Top command processes continuously refreshes at a configurable interval. ps command shows static view of processes, which are not refreshes at a interval.
