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03: Shell script (i.e Bash) interview Q&As – function calls & return values

Q01 How does Bash functions accept input arguments? A01 You can define a function that will accept parameters while calling the function. These parameters would be represented by $1, $2 and so on. Q02 Can Bash functions return a value as an output? … Read more ›...

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03: Shell script interview Q&As for Java developers

Q1 How will you go about reading a CSV file as shown below?

Portfolio,Account,PositionIndicator,Amount
AA123,CURR-AUD,CREDIT,2244.14000000
AA123,CURR-AUD,CREDIT,5.60000000
AA123,CURR-AUD,DEBIT,2249.74000000
AA123,CURR-GBP,CREDIT,0.01000000
AA123,CURR-GBP,DEBIT,0.01000000

Portfolio,Account,PositionIndicator,Amount

AA123,CURR-AUD,CREDIT,2244.14000000

AA123,CURR-AUD,CREDIT,5.60000000

AA123,CURR-AUD,DEBIT,2249.74000000

AA123,CURR-GBP,CREDIT,0.01000000

AA123,CURR-GBP,DEBIT,0.01000000

#!/bin/bash
 
# $# means number of arguments supplied to the command. In this case the file to to be read
if [ $# != 1 ]; then
    echo "Usage: $0 input-file"
    exit 1
else
    infile=$1
fi
 
# assign file descriptor 3 to input file
exec 3< $infile
 
# read till the end of the file
until [ $done ]
do
    read <&3 myline
 #$? is the exit code, and 0 means success and != 0 means not success. That is no line is read.
    if [ $? != 0 ]; then
        done=1
        continue
    fi
 
    # process file data line-by-line in here
 
    echo $myline
done

#!/bin/bash

# $# means number of arguments supplied to the command. In this case the file to to be read

if [ $# != 1 ]; then

echo "Usage: $0 input-file"

exit 1

else

infile=$1

# assign file descriptor 3 to input file

exec 3< $infile

# read till the end of the file

until [ $done ]

read <&3 myline

#$? is the exit code, and 0 means success and != 0 means not success. That is no line is read.

if [ $? != 0 ]; then

done=1

continue

# process file data line-by-line in here

echo $myline

done

Q2 How will you read and then write to another file?

Portfolio,Account,PositionIndicator,Amount
AA123,CURR-AUD,CREDIT,2244.14000000
AA123,CURR-AUD,CREDIT,5.60000000
AA123,CURR-AUD,DEBIT,2249.74000000
AA123,CURR-GBP,CREDIT,0.01000000
AA123,CURR-GBP,DEBIT,0.01000000

Portfolio,Account,PositionIndicator,Amount

AA123,CURR-AUD,CREDIT,2244.14000000

AA123,CURR-AUD,CREDIT,5.60000000

AA123,CURR-AUD,DEBIT,2249.74000000

AA123,CURR-GBP,CREDIT,0.01000000

AA123,CURR-GBP,DEBIT,0.01000000

#!/bin/bash
 
# $# means number of arguments supplied to the command
if [ $# != 2 ]; then
    # $0 is the script name  $1 is input file and $2 is output file  
    echo "Usage: $0 input-file output-file"
    exit 1
else
    infile=$1
fi
 
# assign file descriptor 3 to input file
exec 3< $infile
 
# read till the end of the file
until [ $done ]
do
    read <&3 myline
 #$? is the exit code, and 0 means success and != 0 means not success. That is no line is read.
    if [ $? != 0 ]; then
        done=1
        continue
    fi
    
   # process file data line-by-line
    
    # append to output file. If you run it more than once, it keeps appending.
    echo $myline >> $2 
done

#!/bin/bash

# $# means number of arguments supplied to the command

if [ $# != 2 ]; then

# $0 is the script name $1 is input file and $2 is output file

echo "Usage: $0 input-file output-file"

exit 1

else

infile=$1

# assign file descriptor 3 to input file

exec 3< $infile

# read till the end of the file

until [ $done ]

read <&3 myline

#$? is the exit code, and 0 means success and != 0 means not success. That is no line is read.

if [ $? != 0 ]; then

done=1

continue

# process file data line-by-line

# append to output file. If you run it more than once, it keeps appending.

echo $myline >> $2

done

Q3 How will you read the file and then write to another file with CSV data in different order? …...

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03: Understanding Git terms origin, master, and head

Q1. What is a .git folder? A1. Like .SVN folder for subversion holding the metat data, .git folder holds the Git meta data like remote repository, branch names, etc. If you do

cat head

cat head

it shows that you are on the branch “ … Read more ›...

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04: 50+ SQL scenarios based interview Q&As on N^th value

This SQL scenarios based interview questions & answers focus on nth highest value or nth lowest value. These examples were done on MySQL v8.0 at www.db-fiddle.com. This will answer questions like:

Problem statements & hints

1) Who gets the 2nd highest salary?

…

04: Git Merging Vs rebasing must know interview questions and answers

Q1. What do you understand by the terms merging and rebasing? Can you explain both with a daiagram? A1. Both of these commands are designed to integrate changes from one branch into another branch—they just do it in very different ways. … Read more ›...

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04: Kubernetes (i.e k8s) interview Q&As – Volumes, PVs, PVCs & StorageClass

Q01. What is the difference between Docker & Kubernetes Volumes? A01. Docker Volume and Kubernetes Persistent Volume serve similar purposes, but they differ in a number of ways. a) Docker Volumes are used in Docker environments, … Read more ›...

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04: Kubernetes concepts like kubectl, contexts, kubeconfig & namespaces

This extends Install Kubernetes (i.e. minikube) on Mac.

Step 1: Start the Docker.app on Mac, and then start the minikube cluster from a terminal.


~]$ minikube start

~]$ minikube start

This creates a local Kubernetes cluster. You can confirm if the Minikube cluster is running with:


~]$ minikube status

~]$ minikube status

Kubectl vs Kubernetes Cluster

A Kubernetes cluster can be created on a cloud like AWS,

…

04: Networking basics interview Q&As on OSI model

This extends Networking basics interview Q&As on Protocols. What is an OSI model? Q1. What is an OSI model? A1. The OSI model can be seen as a universal language for computer networking. It is based on the concept of splitting up a communication system into seven abstract layers as...

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05: 50+ SQL scenarios based interview Q&As on N items per group

This extends 15+ SQL scenarios based interview Q&As on Nth value – part 4. This SQL scenarios based interview questions & answers focus on N items per group. These examples were done on MySQL v8.0 at www.db-fiddle.com. … Read more ›...

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05: Apache Kafka Streaming with JSON & Java Tutorial

This extends Apache Kafka JSON example with Java Producer & Consumer Tutorial. In this tutorial, let’s look at KafkaStreams, which enables you to consume from Kafka topics, analyse, transform or aggregate data, and potentially, send it to another Kafka topic.

This kafka tutorial is stateless,

…

05: Azure interview Q&As on Security

Q01. What is Azure Active Directory? A01 Azure Active Directory (i.e. AD) is a cloud-based identity and access management (i.e. IAM) solution that provides a centralised, secure, and scalable platform for managing identities, access control, … Read more ›...

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05: Git & Maven for releasing software artifacts Q&A

Q1. What are the general steps involved in making a software release? A1. #1: Checking out the software artifacts to you build serevr or local box from a source control management (i.e. SCM) system. #2: Giving it a version so it can be uniquely identifieds #3: Building, … Read more...

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05: Kubernetes (i.e k8s) interview Q&As – Service Vs Ingress

Q01. What is a Service in Kubernetes? A01. A Kubernetes service is a logical abstraction for a deployed group of pods in a cluster that perform the same function. Why do you need a service object? Why do you need a service object in k8s when each pod gets its...

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Blog Archives

03: Shell script (i.e Bash) interview Q&As – function calls & return values

03: Shell script interview Q&As for Java developers

03: Understanding Git terms origin, master, and head

04: 50+ SQL scenarios based interview Q&As on N^th value

04: Git Merging Vs rebasing must know interview questions and answers

04: Kubernetes (i.e k8s) interview Q&As – Volumes, PVs, PVCs & StorageClass

04: Kubernetes concepts like kubectl, contexts, kubeconfig & namespaces

04: Networking basics interview Q&As on OSI model

05: 50+ SQL scenarios based interview Q&As on N items per group

05: Apache Kafka Streaming with JSON & Java Tutorial

05: Azure interview Q&As on Security

05: Git & Maven for releasing software artifacts Q&A

05: Kubernetes (i.e k8s) interview Q&As – Service Vs Ingress

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