Top 10 DevOps Interview Questions I have listed down top 10 DevOps interview questions on few topics like, Git, Maven, Jenkins, Docker, Kubernetes, Ansible. Git: Maven ( Hint: Builds, Documentation, Reporting,SCMs,Releases,Distribution) ( Hint: mvn install ) Jenkins Docker docker kill $(docker ps -q) docker rm $(docker ps -a -q) docker rmi $(docker images -q) List:…
Here are few preferred ways to concatenate string variables in bash script Concatenate string variables in Bash 1.Write the variable one after another in echo 2. Use += assignment operator: Second method can be used to append to an integer as well test.sh
Here are the couple of methods to check if a string contains a substring in bash shell script. Methods to check if string contains a substring in Bash Method 1: Use regular expression Output: Method 2: Use wildcard (*) to check the string Output:
Check if file does not exist in Bash Script? You can use -f option in bash script to check if file does not exist. Check if file does not exists if [ ! -f /tmp/users.txt ]; then echo “File not found” fi Parameterize file name in script to check if file doesn’t exist filecheck.sh Check…
How to check if a directory exists in a bash script? In shell script implementation you might come across use case where you need to perform some operation in a directory, but what if directory is not present then your script might break. To avoid the failure and display user friendly error, we should validate…
Please find below list of Shell Script Questions and Answers. Shell Script Questions and Answers 1. Given two integers, X and Y , find their sum, difference, product, and quotient. Constraints X >= -100 Y <= 100 and Y != 100 read X case ${X#[-+]} in *[!0-9]* | ”) echo “Not an integer” ;; esac read Y…
Steps to Install Elasticsearch on centos 7 Prerequisites: Install OpenJDK 8 version sudo yum install java-1.8.0-openjdk.x86_64 Validate the installation java -version If you are installing jdk manually from tar file then make sure if you have configure the JAVA_HOME path correctly. Install Elasticsearch Latest version using Yum. Import the Elasticsearch GPG Key rpm –import https://artifacts.elastic.co/GPG-KEY-elasticsearch…
Check if array contains value in shell script Here is simple bash script to check if array contains value . We can iterate over array and check if value is exist or not but we can also check in if condition if array contains value or not. Use this solution, If array value doesn’t contains…
I usually prefer to execute process in background so that we don’t need to worry if terminal got killed due to timeout or accidently. However, what if you want to kill the process then definitely you will you PID of that process to kill it. You may be interested to check all process which is…
Shell script loop to execute some task for business day and previous business day. If previous business day is weekend then script should skip the weekend date and pick Friday as a previous business day date. Output: Reference: https://unix.stackexchange.com/a/240960/56407
