Step by step resetting Bluetooth on Mac OS

2018-08-23 Guestbook

Latest Mac OS High Sierra version 10.13.6.

Open Terminal and login as user “root”:

1	# rm /Library/Preferences/com.apple.Bluetooth.plist

Reset the Bluetooth Module with Option + Shift + click on bluetooth icon in taskbar. Click on Debug -> Reset the Bluetooth Module

Reset Bluetooth on Mac OS

Reset PRAM / NVRAM: Shut down; power on, immediately press Command + Option + P + R until it resets itself a couple times. Official guide https://support.apple.com/en-us/HT204063
Reset SMC: Shut down; hold down Shift + Control + Option while holding the power button for 10 seconds. Official guide https://support.apple.com/en-us/HT201295

Cloudcraft - visualise AWS environment as isometric architecture diagrams

2018-08-14 Guestbook

Cloudcraft - AWS environment architecture diagrams

References

CloudCraft, https://cloudcraft.co/

An bash, curl and awk example

2018-08-03 Guestbook

This is an example how in a bash script, curl and awk work together, on gist.

Assumptions and Conditional Test execution, ignoring in JUnit

2018-07-07 Guestbook

Sometime you want to ignore some test depends on environment settings. Now both JUnit 4 and JUnit 5 support the concept of assumptions.

Unit Test like this:

@Test
public void testRun() {
 
   Assume.assumeTrue(BooleanUtils.toBoolean(System.getProperty("runtest")));

   // Rest of testcase
}

With Gradle, pass in parameter like this:

1	$ gradle test -Pruntest=false

References

Assumptions and Conditional Test Execution with JUnit 4 and 5, https://reflectoring.io/conditional-junit4-junit5-tests/

Making VSCode like IntelliJ after line commented the cursor automatically moved to next line

2018-06-16 Guestbook

Want to make VSCode key bindings as closed as IntelliJ key bindings like.

Firstly, install VSCode extension macros.

macros

Open Code -> Preferences -> Settings. Add following configuration into User Settings.

"macros": {
    "commentLine": [
        "editor.action.commentLine",
        "cursorDown"
    ]
}

User Settings

Open Code -> Preferences -> Keyboard Shortcuts. Add following configuration into keybindings.json file.

// Place your key bindings in this file to overwrite the defaults
[
    {
        "key": "cmd+/",
        "command": "macros.commentLine",
        "when": "editorTextFocus && !editorReadonly"
    }
]

keybindings.json

That’s newly added Toggle Line Comment looks like after the change:

Toggle Line Comment

Take over Mac OS X Bluetooth Control

2018-06-09 Guestbook

Bluetooth on Mac OS X

Quite annoying when Bluetooth on Mac OS X is off, you can’t turn it on manually via Systme Preferences interface. Now you can install blueutil from https://github.com/toy/blueutil to solve this issue.

igloo:cheatsheets root# blueutil --help
blueutil v2.1.0

Usage:
  blueutil [options]

Without options outputs current state

    -p, --power               output power state as 1 or 0
    -p, --power STATE         set power state
    -d, --discoverable        output discoverable state as 1 or 0
    -d, --discoverable STATE  set discoverable state

    -h, --help                this help
    -v, --version             show version

STATE can be one of: 1, on, 0, off, toggle

Firstly, turn off Bluetooth service via command line:

1 2	igloo:cheatsheets root# blueutil -p 0 igloo:cheatsheets root# blueutil -d 0

Then turn on Bluetooth service via command line:

1 2	igloo:cheatsheets root# blueutil -d 1 igloo:cheatsheets root# blueutil -p 1

Setup and run DEVHINTS.IO cheatsheets on localhost

2018-06-08 Guestbook

This is a static website based on Jekyll framework https://jekyllrb.com/. Need install Jekyll and .

Login as user “root” due to write permission required into /Library/Ruby/Gems directory. Install bundler and Jekyll at first:

1	igloo:cheatsheets root# gem install bundler jekyll

Then install all this application dependent libraries:

1	igloo:cheatsheets root# bundler install

Start up Jekyll website on localhost, with user “terrence” this time:

terrence@igloo ~/Projects/cheatsheets (master ☡=)
17:28:56 𝜆 bundle exec jekyll serve --incremental
Configuration file: /Users/terrence/Projects/cheatsheets/_config.yml
            Source: /Users/terrence/Projects/cheatsheets
       Destination: /Users/terrence/Projects/cheatsheets/_site
 Incremental build: enabled
      Generating...
DEPRECATION WARNING on line 83, column 12 of /Users/terrence/Projects/cheatsheets/_sass/vendor/modularscale/_modularscale.scss:
Unescaped multiline strings are deprecated and will be removed in a future version of Sass.
To include a newline in a string, use "\a" or "\a " as in CSS.

                    done in 3.163 seconds.
 Auto-regeneration: enabled for '/Users/terrence/Projects/cheatsheets'
    Server address: http://127.0.0.1:4000
  Server running... press ctrl-c to stop.

Go to URL: http://127.0.0.1:4000 start searching and using cheatsheets in localhost environment:

DEVHINTS.IO - cheatsheets

To generate static web content ONLY:

terrence@igloo ~/Projects/cheatsheets (master ☡=)
17:28:56 𝜆 bundle exec jekyll build
Configuration file: /Users/terrence/Projects/cheatsheets/_config.yml
            Source: /Users/terrence/Projects/cheatsheets
       Destination: ../terrencemiao.github.io/cheatsheets
 Incremental build: disabled. Enable with --incremental
      Generating...
DEPRECATION WARNING on line 83, column 12 of /Users/terrence/Projects/cheatsheets/_sass/vendor/modularscale/_modularscale.scss:
Unescaped multiline strings are deprecated and will be removed in a future version of Sass.
To include a newline in a string, use "\a" or "\a " as in CSS.

                    done in 43.269 seconds.
 Auto-regeneration: disabled. Use --watch to enable.