lzhuor/terminal-cheatsheet

🤖The palest ink is better than the best memory

🚀John's awesome zsh with examples

ZSH

1. Edit my alias file

 vim $ZSH_CUSTOM/aliases.zsh 

SSH

1. SSH

ssh -i private-key.pem [email protected] 

2. Copy file from remote SSH to local

scp -i private-key.pem [email protected]:server.log /Desktop/dev

3. Copy SSH pub key

pbcopy < ~/.ssh/id_rsa.pub

Linux / Unix

1. Restart service (NGINX example)

service nginx start
service nginx stop
service nginx reload

2. Kill process by port

kill $(lsof -t -i:4000) 

3. Default dir

cd /etc/nginx

Debian

1. apt update and installation

sudo apt update
sudo apt install git

Docker

1. Build Docker image and assign tag to $IMAGE_ID

IMAGE_ID=$(docker build -t go-socket-io . -q)

2. Tag Docker Image with variable $IMAGE_ID

docker tag "$IMAGE_ID" xxxxxx.dkr.ecr.ap-northeast-1.amazonaws.com/go-socket-io

3. Push Docker image

docker push xxxxxx.dkr.ecr.ap-northeast-1.amazonaws.com/go-socket-io

4. Remove dangling images

docker image prune

5. Remove image

docker image rm zenbot_server --force // force

6. Build image with args

docker build --build-arg SSH_PRIVATE_KEY="$(cat ./bucket_privatekey)" --build-arg SSH_PUBLIC_KEY="$(cat ./bucket_pubkey)" -t go-socket-io .

7. Run an image with ENV variables; port forward

docker run --rm -p 3000:3000 -e "RAILS_ENV=staging" my-rails-app:latest

8. Start and SSH into the container, good for debug and develop Dockerfile

docker start -a -i 912176b700a38fb0eaadee778f217030e4acf23066688c8d262d71a5d834b9e0

Vault

https://www.vaultproject.io/docs/commands

Kubernetes

Note: I use k as an alias of kubectl

1. List all pods in the namespace, with more details (thanks ❤️ @chhetripradeep)

k get pods -o wide --namespace staging
k get pods -o wide --all-namespaces

2. Delete resources from config yaml

k delete -f deployment.yaml

3. Delete pods by label k8s-app

k delete pods -l k8s-app=go-socket-io --namespace staging      

4. Get ELB host of a service

export ELB=$(kubectl get svc -n grafana grafana -o jsonpath='{.status.loadBalancer.ingress[0].hostname}')
echo "http://$ELB"

5. AWS EKS secret

kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep eks-admin | awk '{print $1}')

6. AWS EKS aws-auth configmap

kubectl -n kube-system describe configmap aws-auth

7. Get log of a Pod

# Log
k logs pod-a7x0gafg --namespace staging

# Tail the log and grep
k logs --follow ghost-proxy-5496664987-qmbvh --namespace prod | grep 'chicken'

Spinnaker

1. For anyone that wants to have the old spinnaker capabilities back (basically, being able to rollback a deployment from the UI), we can use a little hack. Go to your browsers console, and set:

window.spinnakerSettings.kubernetesAdHocInfraWritesEnabled = true;

AWS

1. Named Profile

export AWS_PROFILE=johnhandsome // custom profile
export AWS_PROFILE=default // default profile

2. Config kubectl profile

aws eks update-kubeconfig --name xxx-cluster-v2

GCP

1. Config kubectl profile

gcloud container clusters get-credentials qa-cluster-2 --zone=asia-southeast1

GCP Bucket

1. Upload files to a Bucket Folder

gsutil cp ./build/main.js gs://cdn/dir/

2. Add allUsers (public Internet) access to a file

gsutil acl ch -u AllUsers:R gs://cdn/dir/main.js

3. Add metadata to a Bucket file

gsutil setmeta -h "cache-control:max-age=0" gs://cdn/dir/main.js
// gsutil setmeta -h "METADATA_KEY:METADATA_VALUE" gs://BUCKET_NAME/OBJECT_NAME

4. Get stats of a Bucket file

gsutil stat gs://BUCKET_NAME/OBJECT_NAME

Helm

1. Start Helm client

export HELM_HOST=:44134 
helm init --client-only             

Tiller Server

export TILLER_NAMESPACE=tiller 
tiller -listen=localhost:44134 -storage=secret -logtostderr

Utils

1. Tail log real-time

tail -f output.log

NPM / YARN

1. Upgrade Yarn

npm upgrade --global yarn 

2. See why dependency exists

yarn why <package>

MongoDB

1. Connection URI

mongodb://<username>:<password>@<hosts>:<port>/<database>?authSource=<authDatabase>

2. Aggregate Query:

db.getCollection('customerjourneys').aggregate(
    [{
        $group : {
            _id : { month: { $month: "$createdAt" }, day: { $dayOfMonth: "$createdAt" }, year: { $year: "$createdAt" } },
            dailyEvents: { $sum: 1 }
                }
            }
    ] )

SDKMan

1. List SDKs

sdk list java

2. Install SDKs

sdk install java 8.0.252.hs-adpt

Flutter

1. Switch Flutter version:

flutter channel <env>

2. Build Android

flutter bundle

3. Build iOS (Release & No Codesign)

flutter build ios --release --no-codesign

4. Flutter Upgrade

flutter upgrade

5. Flutter Clean

flutter clean

6. Flutter Run

flutter run -d <deviceId>

7. Flutter Code Gen - build part file (w/o deletion of existing files)

flutter pub run build_runner build
flutter packages pub run build_runner watch --delete-conflicting-outputs

8. Flutter Code Gen - translate Intl messages in Dart to arb files

flutter pub run intl_translation:extract_to_arb --output-dir=assets/intl ./lib/**/*.dart

Database

Cassandra

1. Alter Keyspace replication (for local)

ALTER KEYSPACE message WITH REPLICATION = { 'class' : 'org.apache.cassandra.locator.SimpleStrategy', 'replication_factor': '1' };

Android

ADB

1. Send SMS

adb emu sms send <sender> <msg>