10 Linux In Addition To Unix Interview Questions In Addition To Answers Asked Inward Wipro Tcs Capegemini

UNIX too Linux Interview Questions too Answers

Questions from diverse UNIX operating systems e.g. Solaris, Linux, IBM AIX or whatever other UNIX operating organization is asked on dissimilar back upwards too programming interviews. I accept ever seen few interview questions from Linux too UNIX along amongst SQL inward almost every Java programming interviews. You but tin non afford non to fix questions from UNIX too Linux until your Job absolutely doesn't require whatever piece of work inward UNIX operating system. I accept collected many UNIX ascendency interview questions too already shared them but I flora that except organization admin jobs, many programming labor interviews alone focus on full general UNIX commands e.g. chmod, find or grep too fundamentals similar finding files too directories, managing file space, networking commands, checking procedure condition too managing file permissions.

In this article, nosotros volition encounter such sort of ofttimes asked interview questions too answers from UNIX too Linux operating System. Questions are rattling key inward nature too non express to Linux alone too as applicable to other UNIX operating systems e.g. Solaris, IBM AIX etc. 

Many of these UNIX questions are asked during diverse interviews on companies similar TCS, Infosys, Citibank , Wipro, Capgemini too Tech Mahindra. As I said they are rattling key too tin survive asked inward whatever company.  If you lot come upwards across whatever other ofttimes asked Linux questions which are non on this listing experience complimentary to suggest.

UNIX too Linux Interview Questions too Answers

Here is my listing of ofttimes asked UNIX too Linux interview questions too answers. All these questions are based upon key commands too concepts which are a must for working on whatever UNIX operating organization e.g. Solaris.

1) How to discovery all the links inward a folder inward UNIX or Linux ?

This is a tricky UNIX question as at that spot is no specific ascendency to discovery all symbolic links. Though you lot accept ln ascendency for creating too updating soft links but zero which gives you lot all the links inward a directory. You demand to operate ls ascendency which lists everything inward the directory too hence you lot demand to listing all the links, as they start amongst "l" as showtime characters, as shown inward in a higher identify article .

here is the actual UNIX ascendency to discovery all links inward a directory :

linux@nyj872:  ls -lrt total 2.0K -rw-r--r--  1 Linux Domain Users  0 December  half-dozen  2011 a drwxr-xr-x+ 1 Linux Domain Users  0 Sep 19 12:30 java/ lrwxrwxrwx  1 Linux Domain Users  4 Sep 19 12:31 version_1.0 -> java/  linux@nyj872:  ls -lrt | grep '^l' lrwxrwxrwx  1 Linux Domain Users  4 Sep 19 12:31 version_1.0 -> java/

2) How to discovery a procedure too kill that?

Another classic UNIX interview questions. Answer of this interrogation is uncomplicated if you lot are familiar amongst ps, grep too kill command. past times using "ps -ef" you lot tin acquire a listing of all procedure too hence operate grep to discovery your procedure too acquire the PID of that process. Once you lot got PID you lot tin operate the kill ascendency to kill that procedure as shown inward this example of kill ascendency inward UNIX.

3) How to run a computer programme inward the background inward UNIX or Linux ?

an tardily UNIX or Linux interview question, alone when you lot know. You tin operate & to run whatever procedure inward the background too hence you lot tin operate jobs to discovery the labor id for that procedure too tin operate  fg too bg ascendency to convey that procedure into foreground too background. See how Linux works to acquire to a greater extent than near running a procedure inward the background.

4) How to sort the output of a ascendency inward opposite social club inward Linux or UNIX ?

One to a greater extent than Linux commands interview interrogation which checks cognition of ofttimes used command. you lot tin operate sort ascendency inward UNIX to sort the output of whatever ascendency past times using PIPE. By using -r pick amongst sort ascendency you lot tin sort the output of whatever ascendency inward opposite order. See these sort ascendency examples for to a greater extent than details.

5) How to practice an archive file inward UNIX or Linux Operating System ?

Another interview interrogation based on cognition of UNIX or Linux command. you lot tin operate the tar command to non bad archives inward UNIX or Linux. you lot tin fifty-fifty combine tar too gzip to practice a compressed archive inward UNIX.

6) What is the pregnant of a file has 644 permission ?

To reply this UNIX or Linux interview question, you lot must know basics of files too directories inward UNIX.  The 644 represents permission 110 for the owner, permission 100 for grouping too 100 for others which way read + write for an possessor who creates that file too read alone permission for grouping too others. 

You tin too encounter The Linux Command Line: Influenza A virus subtype H5N1 Complete Introduction, a majority to acquire to a greater extent than near essential rhythm commands inward Linux.

7) How volition you lot take empty files or directories from /tmp ?

You tin operate the find ascendency to discovery all the empty files too directory too hence combine the output amongst xargs ascendency to take all empty files from /tmp or whatever other directory inward UNIX. See how to delete empty directory too files inward UNIX  for exact ascendency too to reply this UNIX ascendency interview questions inward detail.

8) I accept read permission on a directory but I am non able to come inward it why ?

One to a greater extent than tricky UNIX questions. In social club to acquire into a directory, you lot demand to execute permission. if your directory does non accept to execute permission hence you lot tin non become into that directory past times using the cd command. read UNIX files too directory permissions for to a greater extent than information.

9) How practice you lot discovery all files which are modified 10 minutes earlier ?

This is some other the Linux interview questions from ofttimes used ascendency e.g. discovery too grep. you lot tin use -mtime option of the discovery ascendency to listing all the files which are modified 10 or m minutes before. encounter these find ascendency examples for to a greater extent than details.

10) How to practice you lot discovery the size of directory inward UNIX or Linux ?

This is some other tricky too fleck tough Linux interview interrogation as pop ls ascendency doesn't demonstrate the consummate size of directories inward UNIX. you lot demand to operate du ascendency to acquire a total size of directories including all subdirectories inward UNIX. See How to discovery directory size inward UNIX for exact ascendency too detailed explanation.

You tin too banking concern correspond out Practical Guide to Linux Commands, Editors, too Shell Programming to acquire to a greater extent than near essential Linux commands. One of the best majority on Linux.

11) How practice  you discovery all the procedure listening on a special port inward Linux?
You tin operate the netstat ascendency to discovery all the procedure which are listening on a special port as shown below:

$ netstat -nap | grep 8084 (Not all processes could survive identified, non-owned procedure information volition not survive shown, you lot would accept to survive rootage to encounter it all.) tcp 0 0 0.0.0.0:8084 0.0.0.0:* LISTEN 25314/java

Here 25314 is the procedure id of a tomcat server running on Linux. Since tomcat is a Java spider web application it started amongst coffee ascendency too that's why you lot encounter 25314/java. See here to acquire to a greater extent than near netstat ascendency inward UNIX.

12) How to you lot discovery all the procedure which has opened a file inward Linux?
You tin operate the lsof (list opened upwards files) ascendency to discovery out the procedure which has a file handgrip on the special file. It's rattling useful ascendency to banking concern correspond which procedure are reading a file. You tin operate lsof ascendency as shown below to discovery out all the process:

$ lsof /home/someuser/somefile

will listing all the procedure which has opened this file. you lot tin encounter the command, PID, user too total file path to discovery out the process. See here to acquire to a greater extent than near the lsof ascendency inward Linux.

13) How to mail HTTP asking from a Linux server?
You tin operate either wget or gyre ascendency to mail HTTP request, both GET too POST from a Linux auto as shown below:

$ gyre http://api.openweathermap.org/data/2.5/weather?q=London,uk&appid=bd82977b86bf27fb59a04b61b657fb6f {"coord":{"lon":-0.13,"lat":51.51},"weather":[{"id":804,"main":"Clouds", "description":"overcast clouds","icon":"04n"}],"base":"stations", "main":{"temp":282,"pressure":1022,"humidity":87,"temp_min":277.15, "temp_max":285.15},"visibility":10000,"wind":{"speed":1.5}, "clouds":{"all":90},"dt":1445577409,"sys":{"type":1,"id":5093, "message":0.0201,"country":"GB","sunrise":1445582275,"sunset":1445619056}, "id":2643743,"name":"London","cod":200} 

Here nosotros accept sent a GET asking to /search?q=10-xargs-command-example-in-linux-unix">here to acquire to a greater extent than near gyre ascendency inward UNIX.



14) How practice you lot practice a total directory construction e.g. /parent/child/grandchild inward UNIX?
Well, you lot tin operate the mkdir ascendency amongst option -p to practice all rear directories inward 1 become as shown below:

[#  ]$ mkdir -p software/java/app/config [#  ]$ [#  ]$ pwd /home/john [#  ]$ cd software/java/app/config/ [#  /software/java/app/config]$

You tin encounter hither software/java/app/config directory is created inward but 1 command. See here to acquire to a greater extent than about mkdir ascendency inward UNIX



15) How practice you lot edit a large text file inward UNIX without opening it?
You tin operate the sed command to edit a large file inward UNIX without opening it. The sed stands for flow editor too you lot tin practice discovery supervene upon inward a file as shown below:

$ sed 's/Apple/Microsoft/' bestphone.txt

This ascendency volition discovery "Apple" inward draw too supervene upon it amongst "Microsoft" string inward the file bestphone.txt.


These were some of the frequently asked UNIX too Linux ascendency interview questions too answers which seem inward many information technology Job interview which requires cognition of UNIX operating system, Including programming labor interviews e.g. core Java too J2EE interviews. Questions from UNIX too Linux is too rattling pop during C too C++ programming interviews.

Further Learning
Linux Command Line Basics
Linux Command Line Interface (CLI) Fundamentals
Learn Linux inward v Days too Level Up Your Career

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