Interview topics for QA-Engineer (Linux/UNIX)

Hello Friends! Here I am suggesting few topics for a QA Engineer of Linux/UNIX background. Also providing the URL to the topic for making easy to read instead of searching. Enjoy your reading hoping it adds the value to your knowledge :)

Difference between raw device and block device

How many maximum files can be created in a file system

What is the significance of count= and bs= while creating a file system . COUNT = Copy only X block input blocks. BS = read& write X byte at a time

Fsck in read only and read write mode …What works .What is fsck

What is a superblock .

What is a  magic number

Comparisons of File systems

Big indian , little indian

PATH variable ..All about it .

Environment variables . Where are they stored .

Significance of "set -- ${var}"

Major number and Minor number

Full form of SCSI , ICMP , TCP/IP , SAN , NAS ,

Read about RAID

What are the following terms associated with a disk : sector , cylinder , splindle

What’s a Buffer Cache

What are Pseudo Devices e.g : /dev/null , /dev/urandom , /dev/zero , /dev/random

What’s a Device Driver

mkinitrd , rmmod , lsmod

How to Compile a kernel

Booting process of linux

MBR

Chicken and egg problem while linux booting

Why is swap needed .

Why’s swap twice the size of ram

What is File system Fragmentation

What is a journaling File System ?

What is Access Control Lists  ?

Significance of each directory in Linux : /usr , /var , /tmp , /etc etc …

V & Waterfall Model of Software

TCP/IP Protocol Working .

Significance of (* root,nosquash in /etc/exports )

What is metadata ?

What do you mean by Copy on write

how do you determine the block size of a file system

Change the root Password

How to create a swap file

Learn all about set .

Display amount of free and used memory in the system

What is Virutal Memory

Command : tr

What are signals and how many types of signals are there .

Command to view number of processes since startup

Command to view the content of last executed command file

view number of max process can be launch by AIX kernel

Init Run levels and their details

Significance of "defaults 0 0" in /etc/fstab entries .

Hard link and Soft link

1Kb = ??? How many bytes

How to create hierarchical directories using mkdir in a single command .

SAN NAS concepts

Difference between UNIX and WINDOWS File systems .

Different types of files and their significance ?

What is an inode and what does it signify ?

Mknod and makedev , fork , read , write , open system calls .

Mknod <path> <b> or <c> <major no> <minor no> # mknod ./dev/random b 12 5

How to set signals and traps in shell script .

IP address fields

What happens at TCP/IP level when we type a link 'www.google.com' in browser address bar

How to see major and minor number for a device

How to configure RAID in Linux

What are Semaphores

What are Deadlocks

What is data Abstraction

swap two variables without using third variable

Script to remove all blank lines in a file .

Script to remove spaces at the end of a line in a file .

Script to remove all occourences of ; at the end of a line in a file .

Script to change all small letters in a file to capital letters .

What is shadow password and why is it used .

List Sorting Algorithms

How to recover Corrupted partition from Bad super block

STORAGE QUESTIONS

Segmentation Fault

Ulimit :  modify shell resource limits

Core Dump

Stack Trace

What is a Page Fault

What is thrashing

What are threads

What is the difference between threads and process

What is caching? What is the difference between cache and buffer cache

How to find out which ports are open on UNIX

Different Types of Scheduling Algorithms for Process Management

How is Data Organized on a disk

what are Different Types of Testing .What's Sanity and Regression Testing

Difference Between Load Testing and Stress Testing .

What is Zoning . Explain Hard and Soft Zoning

Serial console device in Linux

Shell special variables.

Waterfall model VS Agile model