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You have an IP address in your network how will you find hostname and vice versa?

This is a standard UNIX command interview question asked by everybody and I guess everybody knows its answer as well. By using nslookup command in UNIX, you can read more about Convert IP Address to hostname in Unix here.

unix command jayvik 2014-03-30 07:17:13

How do you find for how many days your Server is up?

By using uptime command in UNIX

unix command jayvik 2014-03-30 07:16:49

Your application home directory is full? How will you find which directory is taking how much space?

By using disk usage (DU) command in Unix for example du â€“sh . | grep G will list down all the directory which has GIGS in Size.

unix command jayvik 2014-03-30 07:16:25

You have a tab separated file which contains Name, Address and Phone Number, list down all Phone Number without there name and Addresses?

To answer this Unix Command Interview question you can either you AWK or CUT command here. CUT use tab as default separator so you can use

cut -f3 filename.

unix command jayvik 2014-03-30 07:16:00

There is a file Unix_Test.txt which contains words Unix, how will you replace all Unix to UNIX?

You can answer this Unix Command Interview question by using SED command in UNIX for example you can execute sed s/Unix/UNIX/g fileName.

unix command jayvik 2014-03-30 07:15:30

If one process is inserting data into your MySQL database? How will you check how many rows inserted into every second?

Purpose of this Unix Command Interview is asking about "watch" command in UNIX which is repeatedly execute command provided with specified delay.

unix command jayvik 2014-03-30 07:15:00

What is ephemeral port in UNIX?

Ephemeral ports are port used by Operating system for client sockets. There is a specific range on which OS can open any port specified by ephemeral port range.

unix command jayvik 2014-03-30 07:14:31

What is nohup in UNIX?

When you execute a Unix job in the background ( using &, bg command), and logout from the session, your process will get killed. You can avoid this using several methods â€” executing the job with nohup, or making it as batch job using at, batch or cron command.

This quick tip is for beginners. If youâ€™ve been using nohup for a while, leave us a comment and tell us under what situations you use nohup.

In this quick tip, let us review how to make your process running even after you logout, using nohup.

Nohup stands for no hang up, which can be executed as shown below.

nohup syntax:

# nohup command-with-options &

unix command jayvik 2014-03-30 07:14:10

How do you find which remote hosts are connecting to your host on a particular port say 10123?

By using netstat command execute netstat -a | grep "port" and it will list the entire host which is connected to this host on port 10123.

unix command jayvik 2014-03-30 07:12:56

How do you find which processes are using a particular file?

By using lsof command in UNIX. It wills list down PID of all the process which is using a particular file.

unix command jayvik 2014-03-30 07:12:33

How do you find whether your system is 32 bit or 64 bit ?

Either by using "uname -a" command or by using "arch" command.

unix command jayvik 2014-03-30 07:11:38

How do you check if a particular process is listening on a particular port on remote host?

By using telnet command for example â€œtelnet hostname portâ€, if it able to successfully connect then some process is listening on that port. To read more about telnet read networking command in UNIX

unix command jayvik 2014-03-30 07:11:11

How do you set environment variable which will be accessible form sub shell?

By using export for example export count=1 will be available on all sub shell.

unix command jayvik 2014-03-30 07:10:45

In a file word UNIX is appearing many times? How will you count number?

grep -c "Unix" filename

unix command jayvik 2014-03-30 07:09:44

What is "chmod" command? What do you understand by this line â€œr-- -w- --x?

chmod command change file permission. give a right permission.

r-- command read only permission

-w- command give wirte only permission

--x command give a read and wirte both permission.

unix command jayvik 2014-03-30 07:08:30

What is Zombie process in UNIX? How do you find Zombie process in UNIX?

When a program forks and the child finishes before the parent, the kernel still keeps some of its information about the child in case the parent might need it - for example, the parent may need to check the child's exit status. To be able to get this information, the parent calls 'wait()'; In the interval between the child terminating and the parent calling 'wait()', the child is said to be a 'zombie' (If you do 'ps', the child will have a 'Z' in its status field to indicate this.)

Zombie : The process is dead but have not been removed from the process table.

unix command jayvik 2014-03-30 07:06:06

What is difference between HardLink and SoftLink in UNIX?

please write correct answer.anyone know this answer tell me correct answers.

unix command jayvik 2014-03-30 07:05:43

How do you find how many cpu are in your system and there details?

By looking into file /etc/cpuinfo for example you can use below command:

cat /proc/cpuinfo

unix command jayvik 2014-03-30 07:04:05

What is difference between ps -ef and ps -auxwww?

UNIX interview questions answers, UNIX Linux questionsThis is indeed a good Unix Interview Command Question and I have faced this issue while ago where one culprit process was not visible by execute ps â€“ef command and we are wondering which process is holding the file.

ps -ef will omit process with very long command line while ps -auxwww will list those process as well.

unix command jayvik 2014-03-30 07:03:39

What is the difference between Swapping and Paging?

Swapping:

Whole process is moved from the swap device to the main memory for execution. Process size must be less than or equal to the available main memory. It is easier to implementation and overhead to the system. Swapping systems does not handle the memory more flexibly as compared to the paging systems.

Paging:

Only the required memory pages are moved to main memory from the swap device for execution. Process size does not matter. Gives the concept of the virtual memory. It provides greater flexibility in mapping the virtual address space into the physical memory of the machine. Allows more number of processes to fit in the main memory simultaneously. Allows the greater process size than the available physical memory. Demand paging systems handle the memory more flexibly.

unix command jayvik 2014-03-30 07:02:09

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