Create Public/Private key pairs and automate SSH login

ip addr | grep eth0 | grep inet | awk '{print $2}' | awk -F '/' '{print $1}' | awk '{printf "%s:3000", $0}' | clip.exe

#!/usr/bin/env bash

# install github-cli
VERSION=`curl  "https://api.github.com/repos/cli/cli/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/\1/' | cut -c2-`
echo $VERSION
mkdir ~/downloads
curl -sSL https://github.com/cli/cli/releases/download/v${VERSION}/gh_${VERSION}_linux_amd64.tar.gz -o ~/downloads/gh_${VERSION}_linux_amd64.tar.gz
cd ~/downloads
tar xvf gh_${VERSION}_linux_amd64.tar.gz
sudo cp gh_${VERSION}_linux_amd64/bin/gh /usr/local/bin/
gh version
sudo cp -r ~/downloads/gh_${VERSION}_linux_amd64/share/man/man1/* /usr/share/man/man1/
# man gh
gh auth login

rm -r ~/downloads

#create an identity fil name {mycert} as per your need
ssh-keygen -f ~/.ssh/mycert -t ed25519

#/.ssh/config
Host myserver
Hostname {hostname}
IdentityFile ~/.ssh/{identityFile}
User {username}

#from the console
ssh myserver

sudo forever start --sourceDir /opt/bitnami/projects/nesk_back -c "npm run prod" /

# replace _file_name_ with the name of the file that is to be made executable including its filetype suffix, e.g. ".py"
chmod +x _file_name_

sudo puppet agent -v --test

# install docker
sudo apt-get install docker.io

# create and run a container from an image from the Docker Hub
sudo docker run --name firstContainer ubuntu:latest # where firstContainer is the name of the container

# list locally available docker containers
sudo docker ps -a

# open a docker container in interactive mode in the terminal
sudo docker run -it --name myContainer ubuntu:latest # where myContainer is the container name
# you can exit the container by pressing CTRL+P and CTRL+Q

# attach container to terminal
sudo docker attach myContainer # the container will now stay open in the background even after exiting via CTRL+P and CTRL+Q

# execute commands in the container running in the background
sudo docker exec myContainer echo $PATH

# delete containers
sudo docker rm -f firstContainer myContainer

# create new docker image based on your local environment/container
sudo docker commit myNginx docker_id/image_name # where myNginx is the name of your currently running container

# create new docker container from an image from a previously committed image
sudo docker run -it --name nginxNew docker_id/image_name

# list images on your machine
sudo docker image ls

# login to your docker hub account from the terminal
sudo docker login # you will be prompted to enter your id and password

# push an image to docker hub when logged into your docker account
sudo docker push docker_id/image_name

# run a docker container in the background
sudo docker run -d --name myApp nginx

# start an interactive bash terminal for the container running in the background
sudo docker exec -it myApp bashapt-get

# stop a running container
sudo docker stop myApp

# start a stopped container again
sudo docker start myApp

# start a web service using nginx
service nginx start

# check nginx landing page using curl
curl http://localhost:80

# check the status of the web server i.e apache2
sudo systemctl status apache2

# restart the service
sudo systemctl restart apache2

# return network-related information using a combination of flags along with the netstat command to check which process is using a particular port
sudo netstat -nlp

# find python3 programs running
ps -ax | grep python3

# kill a process by its process ID (PID)
sudo kill [process-id]

# let's check for the availability of any service with the keywords "python" or "jimmy"
sudo systemctl --type=service | grep jimmy

# stop and disable a service using
sudo systemctl stop _servicename_ && sudo systemctl disable _servicename_

curl -fsSL https://deb.nodesource.com/setup_current.x | sudo -E bash -
sudo apt-get install -y nodejs

crontab -e

sudo apt install stress
stress --cpu 8

readlink -f file.txt