Git

• To refresh git after git ignore files git rm -r --cached . git rm --cached --ignore-unmatch git ls-files -i --exclude-standard git add . git commit -m "removed files after gitignore"

• to commit changes and push git add . git commit -m "message" git push origin master

• push existing project to github git init git add . git commit -m "pushed content" git remote add origin "url" git remote -v git pull origin master git push origin master

• allow unrelated histories git pull origin master --allow-unrelated-histories

• to delete untracked files conflict git clean -d -fx .

• to clone repo with no username and password git remote -v Note: if https git remote set-url origin git@github.com:/<repo_name>.git

					Django

• start project (pip install django) django-admin startproject "name of project" cd "name of project" django-admin startapp "app name" python manage.py runserver

• running server on network python manage.py runserver 0.0.0.0:8000

• to create requirements file and install pip3 freeze > requirements.txt pip3 install -r requirements.txt

				Jupyter Notebook

• run jupyter on network jupyter notebook --ip="enter ip of wifi"

• to ignore warnings import warnings warnings.filterwarnings('ignore')

				Angular

• start an first angular app npm install -g @angular/cli ng new my-app cd my-app ng serve --open

• to run existing npm i npm server -o

• for Production Build ng build --prod

• to create a new component ng g c "name_of_component"

• to create a service like api ng g s api

• for testing ng test

• on netowrk ng serve --host=0.0.0.0 --port=8080

• documenting code npm install --save-dev @compodoc/compodoc Then update your package.json "scripts": { "compodoc": "compodoc -p tsconfig.json" } npm run compodoc

• for production end with express npm i npm i --save compression ng build --prod npm install --save express set "imports: [RouterModule.forRoot(routes, {useHash: true})]," change "base href='/#/'"

• make Angular SEO friendly ng add @ng-toolkit/universal npm install npm run build:prod npm run server

				Linux Commands

• to open a port ufw allow port_number

• to delete a folder rm -r "folder_name"

• to handle screen screen -r # resume ctrl-a d # to detach screen -ls # to list screens

• to check if port is free or not nc -l 8080

				Python

• to create a virtual environment pip3 install virtualenv virtualenv -p /usr/bin/python3.6 venv --no-site-packages

				Hadoop

• to start hadoop cluster start-all.sh stop-all.sh

• file commands hdfs dfs -ls hdfs dfs -mkdir dir_name hdfs dfs -put source_file destination_file

• to format hdfs namenode hdfs namenode -format

				Google Cloud

• upload file to google cloud gcloud compute --project [project_name] scp --zone [zone_name] [source_file] [instance_name]:~/

				Docker

• to build docker from Dockerfile docker build -t name_docker .

• to run docker docker run -p 3000:80 --rm name_docker

• to list docker images docker images docker images ls

• to check docker process already running docker-compose ps

• to remove docker compose process docker-compose rm

• to delete docker iamges docker rmi docker_id

• to build from docker-compose.yml docker-compose up --build

• run specific command in a service/container docker-compose run djangoapp python hello/manage.py migrate --noinput

				Ionic

• create ionic project ionic start app_name blank_or_tabs_or_menuslide

• start server ionic serve ionic serve -l # for lab

• add platform ionic cordova add android

• run on emulator ionic cordova run android

• install plugins in cordova ionic cordova plugin add firebase

				MEAN 

• install dependencies node -v npm -v npm install -g express npm install express-generator -g npm install jade npm install --save express-handlebars npm install -g node-gyp npm install -g bower

• add in package.json "jade": "~1.11.0", "kerberos": "~0.0.24", "mongodb": "~2.0.33"

• start project express sampsite

• run app npm start

• database make a data directory mongod -dbpath "path of data directory" mongo # to start mongo shell

• set mongodb in app.js var mongodb = require('mongodb');

				Build Web Apps in second (Nativefier)

• to install package npm install -g nativefier

• to build fullscreen nativefier -p linux -a x64 https://website-app-url.com --full-screen

• to force a maximized app nativefier -p linux -a x64 https://website-app-url.com --maximize

• to enable flash player nativefier -p linux -a x64 https://website-app-url.com --flash

				Tech Tools

1 - To compress images https://compressor.io/

2 - To generate documentation of Angular projects npm install --save-dev @compodoc/compodoc add line in package.json "compodoc": "./node_modules/.bin/compodoc -p tsconfig.json -w -s" npm run compodoc

3 - To host static website https://netlify.com

4 - To generate SSL certificate and host website DNS https://cloudflare.com

				Capacitor

npm install --save @capacitor/core @capacitor/cli npx cap init

npx cap add android npx cap add ios npx cap add electron

ionic start myApp tabs --capacitor ionic build

npx cap open android

				React Native

1 - start first app react-native init AppName

2 - run on android react-native run-android

				Commands

1 - Generate keystore keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 20000

2 - generate hash key keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64

				Help

1 - To install dependencies due to unmet ones sudo apt-get install -f