Hitachi Astemo Cloud Devops Engineer Interview Questions and Answers

Use grep command to check pattern in all files in current directory

• Use 'grep' command with the desired pattern and '*' wildcard to search for the pattern in all files in the current directory

• For example, to search for the pattern 'example' in all files in the current directory: grep 'example' *

Multistage pipeline in Jenkins allows for defining complex build pipelines with multiple stages and actions.

• Multistage pipeline is defined in a Jenkinsfile using declarative syntax

• Each stage in the pipeline represents a specific part of the build process

• Stages can have multiple steps like build, test, deploy, etc.

• Parallel stages can be defined to run multiple tasks concurrently

• Post actions can be defined to execute tas

Shell script to display current process with only process id

• Use the 'ps' command to list all processes

• Pipe the output to 'awk' to print only the process id column

• Exclude the header line from the output

Use Jenkins Pipeline to clean workspace after each build

• Add a post-build step in Jenkins Pipeline to delete workspace contents

• Use 'deleteDir()' command in Jenkins Pipeline to remove workspace directory

• Consider using 'sh' or 'bat' commands to execute shell or batch scripts for cleaning workspace

To check memory and storage in Linux, you can use commands like free, df, and du.

• Use 'free' command to check memory usage and available memory

• Use 'df' command to check disk space usage

• Use 'du' command to check disk usage of specific directories