Tell me the 5 differences between Linux and Unix? 

Answer
Unix and Linux:
1. UNIX is very old and Linux is based on it.

2. Linux is a good desktop OS while UNIX lacks the user friendliness needed for general computing.

3. UNIX is intended for mainframes and high end computers and cannot run on mos PCs while Linux can go from mainframes down to low end personal computers.

4. UNIX is proprietary while Linux is shared using the Licensing of the GNU.

5. Linux file system is ext3.

6. Selinux enabled on linux

7. Linux using advanced file editor like vim.
 

How do I check which nfs version I am using?

Answer
rpm -qa | grep nfs
 

How to check all open ports on linux machine and block unsed ports?

Answer
# 3 
#netstat -tulp
or
#netstat -tulpn

to verfy the open ports
 

How can you see all mounted drives? 

Answer
# 8 
mount -l is the perfect answer, as this commands lists all the mounted drive / partitions in the system ( temperory or permenent), 
here root / user may have mounted / unmounted,
some other partitions
fstab gives us the information that which partitions has to be  mounted whenever the system starts.
  

What restrict telnet for root itself but allow for other user?

Answer
# 1 
vi /etc/pam.d/login

auth      required          pam_securetty.so== 1st line 
Should be placed as required. 
If we change the option as sufficient instead of required telnet can login as "root".
 

Tell me some of the Linux HotKeys do you know? 

Answer
# 1 
alt+f1 for application menu
ctl+l to clear screen
alt+f2 to open run application window
alt+f3 for find 
alt+f4 to close application
alt+f9 to minimise window
 

How to trace any process background processing? 

Answer
# 1 
ps -aux
what is difference between $@ and $* in UNIX Shell script Answer
# 1 
In a shell script :

$@: each quoated string treated as a separate argument 
while gving at command line.

$*: stores the complete set of positional parameters as a 
single stri

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