This blog is your go-to resource for essential commands across multiple tools and technologies, including Docker ,NPM, Git, Shell Scripting, and SonarQube. Whether you're a beginner looking to get started or a seasoned professional wanting a quick reference guide, this blog covers the most crucial commands you need to streamline your workflow.

Docker Commands docker --version Check the installed Docker version. docker pull <image_name> Download an image from a registry (e.g., docker pull nginx). docker images List all locally available Docker images. docker rmi <image_id> Remove a specific Docker image. docker build -t <image_name>:<tag> . Build a Docker image from a Dockerfile in the current directory. docker run <image_name> Create and start a container from an image. docker run -d <image_name> Run a container in detached mode (background). docker run -it <image_name> /bin/bash Run a container interactively with a shell. docker ps List running containers. docker ps -a List all containers (running and stopped). docker start <container_id> Start a stopped container. docker stop <container_id> Stop a running container. docker restart <container_id> Restart a container. docker rm <container_id> Remove a stopped container. docker exec -it <container_id> /bin/bash Open a shell inside a running container. docker logs <container_id> View logs of a container. docker inspect <container_id> Display detailed information about a container. docker network ls List all Docker networks. docker volume ls List all Docker volumes. docker-compose up Start containers defined in a docker-compose.yml file. docker-compose down Stop and remove containers, networks, and volumes defined in docker-compose.yml. docker system prune Remove all unused containers, networks, images, and volumes. docker stats Display live resource usage statistics for containers. docker login Log in to a Docker registry (e.g., Docker Hub). docker push <image_name> Push an image to a Docker registry.		Essential npm Commands Initialize a Project npm init Creates a package.json file interactively. npm init -y Skips the prompts and creates a default package.json. Install Dependencies npm install Installs a package and adds it to dependencies in package.json. npm install --save-dev Installs a package as a development dependency. npm install Installs all dependencies listed in package.json. Uninstall a Package npm uninstall Removes a package and updates package.json. Update Dependencies npm update Updates all installed dependencies to the latest compatible versions. npm update Updates a specific package. Check Outdated Packages npm outdated Lists outdated packages with available updates. Run Scripts from package.json npm run Executes scripts defined in package.json under the "scripts" section. npm run start Commonly used to start an application. Run a Package Without Installing It Globally npx Executes a package directly without installing it globally. Install a Package Globally npm install -g Installs a package globally, making it available system-wide. Uninstall a Global Package npm uninstall -g Removes a globally installed package. List Installed Packages npm list Shows installed dependencies in the current project. npm list -g --depth=0 Lists globally installed packages. Clear npm Cache npm cache clean --force Clears the cache to fix potential issues. Check the npm Version npm -v Displays the installed npm version. npm --version Alternative command for checking the version. Upgrade npm npm install -g npm Updates npm to the latest version.
GIT Commands Initialize a Git Repository git init Clone a Repository git clone Check Repository Status git status Add Files to Staging git add . Commit Changes git commit -m "Your commit message" View Commit History git log Switch Branches git checkout Pull Latest Changes git pull origin Push Changes to Remote Repository git push origin Undo the Last Commit git revert		Shell Scripting Commands #!/bin/bash Specify the script should run in Bash. echo "text" Print text or variables to the terminal. read variable_name Read user input and store it in a variable. if [ condition ]; then ... fi Conditional statement for decision-making. for i in {1..10}; do ... done Loop through a range of values. while [ condition ]; do ... done Execute a block of code repeatedly while a condition is true. case $variable in pattern) ... ;; esac Multi-way conditional statement. grep "pattern" file.txt Search for a pattern in a file. awk '{print $1}' file.txt Extract specific columns or data from a file. sed 's/old/new/g' file.txt Stream editor for text substitution and manipulation. chmod +x script.sh Make a script executable. ./script.sh Execute a shell script. export VARIABLE=value Set an environment variable. tar -czvf archive.tar.gz folder/ Compress files or directories into a tarball. ssh user@host Connect to a remote server via SSH. SonarQube/SonarCloud Commands sonar-scanner Run the SonarQube scanner to analyze code. sonar-scanner -Dsonar.projectKey=my_project Specify a project key for analysis. sonar-scanner -Dsonar.sources=. Analyze the current directory as the source code. sonar-scanner -Dsonar.host.url=http://localhost:9000 Specify the SonarQube server URL. sonar-scanner -Dsonar.login=your_token Authenticate using a SonarQube token. sonar-scanner -Dsonar.exclusions=**/test/**,**/node_modules/** Exclude specific directories from analysis. sonar-scanner -Dsonar.coverageReportPaths=coverage.xml Specify the path to the coverage report. sonar-scanner -Dsonar.language=java Specify the programming language for analysis. sonar-scanner -Dsonar.branch.name=feature-branch Analyze a specific branch. sonar-scanner -Dsonar.qualitygate.wait=true Wait for the Quality Gate status after analysis. sonar-scanner -Dsonar.java.binaries=target/classes Specify Java binaries for analysis. sonar-scanner -Dsonar.tests=src/test Specify the directory containing test files. sonar-scanner -Dsonar.sourceEncoding=UTF-8 Set the source code encoding. sonar-scanner -Dsonar.verbose=true Enable verbose logging for debugging. sonar-scanner -Dsonar.scm.provider=git Specify the SCM provider (e.g., Git).

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