recent posts related to the mac os x operating system

How to Start the Mac Screen Saver with a Keyboard Shortcut in MacOS alvin March 24, 2018 - 5:27pm

This is a decent article about how to start the Mac/MacOS screensaver using a keyboard shortcut (keystroke).

Why is my MacBook warm when the lid is closed (in sleep mode)? alvin March 22, 2018 - 12:29pm
Table of Contents1 - Troubleshooting2 - My solution3 - Possible problem: Energy Saver settings4 - Possible problem: Bluetooth settings5 - More information6 - Summary

When I woke up last night it was a little windy outside, so I decided to unplug my MacBook Pro because the power tends to flicker here. When I picked up the MacBook I noticed that it was very warm, even though the lid was closed and it was in sleep mode. This morning I decided to dig into the “Why is my MacBook hot even though the lid is closed and it’s in sleep mode” question.

How to show the largest files under a directory on Mac OS X (Unix) alvin December 23, 2017 - 1:00pm

Here’s an example that shows how to find the largest files under a directory on MacOS and Linux/Unix systems.

A du/sort command to show the largest files under a directory on Mac OS X

The Unix/Linux command that worked for me on my MacOS system is this:

$ du -a * | sort -r -n | head -10

du is the disk usage command, and the -a flag says, “Display an entry for each file in a file hierarchy.” Then I use the sort command to sort the du output numerically and in reverse. After that, head -10 shows only the first ten lines of output. In the Music folder on my Mac the command and output look like this:

How to change the Mac Terminal title from the command line alvin December 14, 2017 - 9:23am

Mac Terminal FAQ: How can I change the title on the Mac Terminal app from the Mac/Unix command line?

I've been working on a project where I have three Mac Terminal tabs open at one time, and I found it was much easier to work this way when I changed the title on each Terminal window. This helped me easily identify what I was doing in each Terminal window.

Changing the Mac Terminal title

The basic escape sequence you need to change the Terminal title from the command line is this:

MacOS screen annotation/presentation software alvin August 28, 2017 - 6:00pm

I was going to write a little application to let me annotate my MacOS screen during presentations, but the Ink2Go product looks like it does exactly what I was thinking. As I’m creating a video presentation, such as when showing how to write some Scala or Android code, I want to be able to draw on the screen, such as writing text, arrows, circles, and boxes to highlight parts of the screen. Ink2Go looks like what I want.

Developing an OSX Application in Java alvin August 16, 2017 - 9:39am

This is a good guide for things to be aware of when creating Mac/macOS applications using Java. It mostly includes a lot of information about the library/classes.

MacOS/Java AppBundler error: NoSuchFileException: Info.plist alvin August 14, 2017 - 8:14pm

If you’re using the Oracle AppBundler to build a Mac/MacOS application bundle from a Java application and run into this error when running Ant:

NoSuchFileException: <directory path here> Info.plist

I have found that the problem is that I have not set and exported JAVA_HOME. To set and export JAVA_HOME on MacOS 10.12, I use this command in the shell script I use to build my Mac/Java app: