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MacOS screen annotation/presentation software

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.

A collection of Unix/Linux ‘grep’ command examples

Linux grep commands FAQ: Can you share some Linux/Unix grep command examples?

Sure. The name grep means "general regular expression parser", but you can think of the grep command as a "search" command for Unix and Linux systems: it's used to search for text strings and more-complicated "regular expressions" within one or more files.

I think it's easiest to learn how to use the grep command by showing examples, so let's dive right in.

How to copy text from the MacOS Terminal to the clipboard

If you ever need to copy text (or a text file) from the MacOS Terminal to the Mac clipboard, I can confirm that the macOS pbcopy command works. It reads from STDIN and copies the text to the clipboard, so commands like these work:

$ echo "foo bar baz" | pbcopy

$ cat /etc/passwd | pbcopy

“Your password is too similar to a previous one”

I don’t know too much about salting, hashing, and encryption, but it always upsets me when I see a “Your password is too similar to a previous one” message like this, because I assumed that whoever was showing this message was storing my passwords as plain text somewhere. This thread on Twitter, started by Anna Filina, addresses this topic.

Opportunity knocking

“Knock, knock.”

“Who’s there?”

“Opportunity.”

“Could you maybe just shoot me a text?”

How to insert text with a custom TextMate Bundle snippet

As a quick note to self, I just created a TextMate Bundle snippet to insert some text at the current cursor position. Using TextMate 2.0.x, I did it with the following steps. I’ll go through these steps quickly as I’m just writing this for myself:

Android: How to store static Help text in an Android XML file

As a note to self, when you’re writing an Android application and you think you want to store some static text in an external file, a better approach can be to create a resource file under res/values.

For example, I’m currently adding some help text to an Android app, and to do that I created a file named strings_help.xml under the res/values directory. That file contains HTML wrapped in an XML CDATA tag, like this:

An Android method to center text when using Canvas drawText

I’m not an expert on this subject just yet, but if you want the source code for an Android method to center text that you want to use with the drawText method of the Canvas class, I know that this code works in two places in my current Android app: