Today I Learn (@skpaik)

Hi I'm Sudipta Kumar Paik. I write everything, what I learn every day.

Recursive full permission to a folder and sub folder

chmod -R 777 ./

Recursively remove folders in a directory

Remove all .DS_Store file from a directore

find . -name ".DS_Store" -print -delete

Remove all target folder from a directore

find . -name "target" -type d -exec rm -rf {} \;

Remove all node_modules folder from a directore

find . -name "node_modules" -type d -exec rm -rf {} \;

Auto generate aws credential on local machine

Download file aws_credentials_create.js

Open file ad add list of aws credentails on const accounts = line 5

Add Permission

chmod +x ./aws_credentials_create.js

To run the file

./aws_credentials_create.js

Create Command file

Create a fine in root of the project. Named run.sh Add following contents

#!/usr/bin/env bash
npm run deploy:sam:dev:feature feature-DXP-4868
.
.

Add Permission

chmod +x ./run.sh

To run the file

./run.sh

Kill nodejs process

Command 1:

ps aux | grep node

Output

root        3766  0.5 13.3 989252 130196 ?       Ssl  Jul29 137:14 node /home/ubuntu/code/backend/server.js
ubuntu     55299  0.0  0.0   8168   736 pts/0    S+   08:46   0:00 grep --color=auto node

Command 2:

sudo lsof -PiTCP -sTCP:LISTEN

Output

Password:
COMMAND     PID  USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
ControlCe  1573 sudiptambp    5u  IPv4 0xd6a1f5fb0c929ad9      0t0  TCP *:7000 (LISTEN)
ControlCe  1573 sudiptambp    6u  IPv6 0xd6a1f5f17447b1a1      0t0  TCP *:7000 (LISTEN)
ControlCe  1573 sudiptambp    7u  IPv4 0xd6a1f5fb0c940fc9      0t0  TCP *:5000 (LISTEN)
ControlCe  1573 sudiptambp    8u  IPv6 0xd6a1f5f17447c9a1      0t0  TCP *:5000 (LISTEN)
rapportd   1587 sudiptambp    4u  IPv4 0xd6a1f5fb09e2f0f9      0t0  TCP *:59400 (LISTEN)
rapportd   1587 sudiptambp    8u  IPv6 0xd6a1f5f17a2931a1      0t0  TCP *:59400 (LISTEN)
PanGPS     1684  root         7u  IPv4 0xd6a1f5fb0c93f9a9      0t0  TCP localhost:4767 (LISTEN)
idea      64752 sudiptambp   14u  IPv6 0xd6a1f5f1744969a1      0t0  TCP localhost:6942 (LISTEN)
idea      64752 sudiptambp   33u  IPv6 0xd6a1f5f1744981a1      0t0  TCP localhost:63342 (LISTEN)
idea      64752 sudiptambp  100u  IPv6 0xd6a1f5f1744821a1      0t0  TCP localhost:59804 (LISTEN)
java      65751 sudiptambp  237u  IPv6 0xd6a1f5f17a2a39a1      0t0  TCP localhost:59813 (LISTEN)
com.docke 65761 sudiptambp   87u  IPv6 0xd6a1f5f17a2921a1      0t0  TCP *:27017 (LISTEN)

Find the process ID (second from the left):

Command 2:

kill -9 PROCESS_ID

Example

sudo kill -9 3766

This may also work

sudo killall node

Linux release used ports

Command 1:

lsof -i:8080

OR

Command 2:

lsof -i:5000

OR

Command 3:

lsof -i:3000

Linux check used ports

Command 1:

netstat -tulpn | grep LISTEN

OR

Command 2:

sudo lsof -i -P -n | grep LISTEN

Generating the SSH keys for github.com

Command 1: For company use

ssh-keygen -t ed25519 -C "info@newCompany.com" -f "id_rsa_github_newCompany"

OR

Command 2: For personal use

ssh-keygen -t ed25519 -C "me@gmail.com" -f "id_ed25519_github_personal"

OR

Command 3: If you are using a legacy system that doesn't support the Ed25519 algorithm, use:

ssh-keygen -t rsa -b 4096 -C "info@newCompany.com" -f "id_rsa_github_newCompany"

If you want to configure github, please follow this page .

Git Reset hard head

[cmd] in terminal

git reset --hard HEAD

Ref: https://stackoverflow.com/q/9529078

Tech: git, reset

Date: 2020-04-15

Python apply PEP8 Standard

[cmd] in active virtualenv

pip install isort

From the command line:

isort mypythonfile.py mypythonfile2.py

From recursively:

isort -rc .

or to see the proposed changes without applying them:

isort mypythonfile.py --diff

Ref: https://pypi.org/project/isort/

Tech: python, pep8, standard

Date: 2020-04-01

Edit Mac's Hosts file

Install the MySQL server by using the Ubuntu package manager:

• Open a Finder window.
• Select Applications from the sidebar.
• Double-click on Utilities.
• Double-click Terminal.
• type sudo nano /etc/hosts and then hit return.
• Enter your administrator password and then hit return. Once you're done, hold down the control and O keys to save the file, then control and X to exit.
• One last step: sudo killall -HUP mDNSResponder

Ref: https://www.imore.com/how-edit-your-macs-hosts-file-and-why-you-would-want#how-to-edit-the-hosts-file

Tech: host, mac

Date: 2019-11-13

Python3 Virtualenv in MAC OS

1. Install virtualenv

sudo pip install virtualenv

2. Start virtualenv in python3

virtualenv -p python3 .env

OR

python3 -m venv .env

Here .env is environment name

3. Activate virtualenv in python3

source .env/bin/activate

3. Deactivate virtualenv in python3

source deactivate

Tech: python3, virtualenv, mac

Date: 2019-10-31

Install Docker CE in Ubuntu

1. Update the apt package index:

sudo apt-get update

2. Install packages to allow apt to use a repository over HTTPS::

sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common

3. Add Docker’s official GPG key:

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

4. Verify that you now have the key with the fingerprint:

sudo apt-key fingerprint 0EBFCD88

5. Use the following command to set up the stable repository:

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

6. Update the apt package index:

sudo apt-get update

7. Install the latest version of Docker CE and containerd:

sudo apt-get install docker-ce docker-ce-cli containerd.io

8. Verify that Docker CE is installed correctly by running the hello-world image:

sudo docker run hello-world

9. Create the docker group:

sudo groupadd docker

10. Add your user to the docker group:

sudo usermod -aG docker $USER

Ref: https://docs.docker.com/install/linux/docker-ce/ubuntu/

Tech: docker,docker-ce,ubuntu

Date: 2019-07-01

Remove Docker Containers, Images, Volumes, and Networks

Removing All Unused Objects

sudo docker system prune

Remove all unused volumes

sudo docker system prune --volumes

List of all active and inactive images

sudo docker image ls -a

Remove one or more images

sudo docker image rm 75835a67d134 2a4cca5ac898

// Here '75835a67d134' & '2a4cca5ac898' is image ID

Delete all local Docker images

docker rmi -f $(docker images -a -q)

Delete all Docker containers including its volumes use

docker rm -vf $(docker ps -a -q)

List of all active and inactive containers

sudo docker container ls -a

Remove one or more containers

sudo docker container rm cc3f2ff51cab cd20b396a061

// Here 'cc3f2ff51cab' & 'cd20b396a061' is container ID

Stop and remove all containers

sudo docker container stop $(sudo docker container ls -aq)

sudo docker container rm $(sudo docker container ls -aq)

N.B.: if no container running, then error may shown.

Completely uninstall docker

Step 1:

sudo dpkg -l | grep -i docker

Step 2:

sudo apt-get purge -y docker-engine docker docker.io docker-ce

sudo apt-get autoremove -y --purge docker-engine docker docker.io docker-ce

Step 3:

sudo rm -rf /var/lib/docker

sudo rm /etc/apparmor.d/docker

sudo groupdel docker

sudo rm -rf /var/run/docker.sock

Step 4:

Download the file and open command line Then run

sudo ./delete_docker_fully.sh

Uninstall old versions:

sudo apt-get remove docker docker-engine docker.io containerd runc

Ref:

1. https://linuxize.com/post/how-to-remove-docker-images-containers-volumes-and-networks
2. https://askubuntu.com/a/1021506/700201

Tech: docker, ubuntu

Date: 2019-03-06

Installing nano and vim in docker/Ubuntu

apt-get update

apt-get install vim nano

Ref: https://stackoverflow.com/a/37156748/705293

Tech: vim, docker, nano, ubuntu

Date: 2019-03-06

Installing MySQL in Ubuntu

Install the MySQL server by using the Ubuntu package manager:

sudo apt-get update

sudo apt-get install mysql-server

Ref: https://support.rackspace.com/how-to/installing-mysql-server-on-ubuntu/

Tech: mysql, ubuntu

Date: 2019-03-04

Uninstalling MySQL in Ubuntu

Use apt to uninstall and remove all MySQL packages:

sudo apt-get remove --purge mysql-server mysql-client mysql-common -y

sudo apt-get autoremove -y

sudo apt-get autoclean

Remove the MySQL folder:

sudo rm -rf /etc/mysql

Delete all MySQL files on your server:

sudo find / -iname 'mysql*' -exec rm -rf {} \;

Ref: https://help.cloud66.com/node/how-to-guides/databases/shells/uninstall-mysql.html

Tech: 'mysql', ubuntu

Date: 2019-03-04

Mongo dump and restore command

Dump or Take backup:

mongodump -h 127.0.0.1:27017 -d dbname --out bjson_folder

Restore to database:

mongorestore -h 127.0.0.1:27017 -d dbname bjson_folder/dbname

Here:

>Host = 127.0.0.1:27017(-h)

>Database name = dbname(-d)

>Dump locations BSON/JSON files = bjson_folder/(dbname auto create)(--out)

>Restore Locations of backup BSON/JSON folders = bjson_folder/dbname

Tech: mongodb

Date: 2019-02-27

Docker entering file system

docker ps

docker exec -it name-of-container bash

Tech: docker

Date: 2019-02-07

Unit Testing in ExpressJs(NodeJs)

Ref: https://codehandbook.org/unit-test-express-route

Tech: mocha, nodejs, expressjs

Date: 2019-01-28

Install Python & Django on Windows

Run command on Powershell

Download from https://www.python.org/downloads/

pip install virtualenv

cd ~/Desktop

mkdir pages

cd pages

virtualenv venv

.\venv\Scripts\activate

pip install django

django-admin startproject app .

python manage.py startapp pages

deactivate

Ref: https://www.codingforentrepreneurs.com/blog/install-python-django-on-windows/

Tech: django, python

Date: 2019-01-23

Activate PyCharm

• Ref: https://www.codeblogbt.com/archives/282803
• Or you can activate using PyCharm_Activation_Code.txt
• Before activate please update hosts file to

0.0.0.0 account.jetbrains.com

Tech: pycharm, python

Date: 2019-01-22

Check out a remote Git branch

git checkout -b feature_connect_issue remotes/origin/feature_connect_issue

Ref: https://stackoverflow.com/a/1783426/705293

Tech: 'git'

Date: 2019-01-16

Delete Local Branch

git branch -D branch_name

Ref: https://stackoverflow.com/a/2003515/705293

Tech: 'git'

Date: 2019-01-16

How To Install Linux, Apache, MySQL, PHP (LAMP) stack on Ubuntu 16.04

A "LAMP" stack is a group of open source software that is typically installed together to enable a server to host dynamic websites and web apps. This term is actually an acronym which represents the Linux operating system, with the Apache web server. The site data is stored in a MySQL database, and dynamic content is processed by PHP. Ref: https://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-on-ubuntu-16-04

Tech: php, mysql

Date: 2019-01-10

Faveo

Faveo is a suport ticket system. Ref: https://github.com/ladybirdweb/faveo-helpdesk

Tech: 'php','mysql'

Date: 2019-01-10

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