ntamvl

Use Sweetalert2 on Rails 7

Install sweetalert2 package

yarn add sweetalert2

OR if you use importmap

./bin/importmap pin sweetalert2

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FFMPEG: Convert & Edit Video via Command Line

FFMPEG is a free software that lets you create/edit/convert videos via command line. You can download and install FFMPEG for Linux, Windows, and Mac Operating System.

FFMPEG provides a lot of features that you can apply to an video like:

– get detailed information of the video
– record video
– convert video to audio
– convert video from one format to another

ntamvl

Systemd Service for homebridge on Raspberry Pi

Check location of homebridge

pi@raspberrypi:~/.homebridge $ which homebridge
/usr/bin/homebridge

Create file /etc/systemd/system/homebridge.service

ntamvl

Use aws-sdk-mock to test AWS SSM

Example:

const AWSMock = require("aws-sdk-mock");
import AWS = require("aws-sdk");
AWSMock.setSDKInstance(AWS);

import "mocha";

ntamvl

Compress multiple folders, each into its own zip archive

for i in */; do tar -czvf "${i%/}.tar.gz" "$i"; done

Example:

for i in */; do 

ntamvl

How to create a Ruby gem that adds Rake tasks

Create a gem

One way to do this is to use bundler to scaffold our gem:

bundler gem my_gem

Add rake tasks to our gem

I prefer to put tasks meant to manage the gem itself in lib/tasks, and tasks the gem is meant to provide to gem users in lib/my_gem/tasks.

ntamvl

How to update/add a file in the Docker Image

The post discusses how to alter a standard docker image pulled from a Public repository in Docker hub as per your need. For the example of this post, we will pull a latest CentOS docker image and add a test directory test_dir and create a test file test_file into it.

Adding a directory and image in the docker image

1. First step is to pull a latest CentOS image from docker hub.

# docker pull centos
Using default tag: latest

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OS X Terminal color prompt

Update .bash_profile with content:

export CLICOLOR=1
export PS1="\[\e[36m\]\w\[\e[0m\]$ "
alias ll='ls -GFhl' dir='ls -GFhl'
alias start=open
printf "\033]0;`date "+%a %d %b %Y %I:%M %p"`\007"

ntamvl

On macOS Mojave, rbenv install 2.6.1 hangs at "use realline from homebrew"

First install readline from homebrew

brew install readline
brew link --force readline

This fixed it for me:

ntamvl

Remove full path from terminal

The part before the $ in a shell is called prompt. It can be configured by changing the variable $PS1. There are is a similar question with good answeres.

The man page (see "Bash" and there "PROMPTING") says:

      \w     the  current working directory, with $HOME
             abbreviated with a tilde (uses the value of the
             PROMPT_DIRTRIM variable)
 \W the basename of the current working directory,