version

Scala java.lang.NoSuchMethodError: scala.Predef$.augmentString error

It's been a while since I've seen a problem related to using different versions of Scala, but I just ran into it now.

By Alvin Alexander on January 10, 2013

How to show the CentOS Linux version

CentOS Linux FAQ: What commands can I use to show what version of CentOS Linux I'm using?

There are at least two different ways to show what version of CentOS Linux you're using. First, you can use the Linux cat command on the /etc/redhat-release file. Here's the command, and sample output:

# cat /etc/redhat-release

CentOS release 5.6 (Final)

You can also use the lsb_release command with the -a option. Here's that command, and its output:

By Alvin Alexander on December 4, 2011

How do I Git help?

Git help FAQ: How do I Git help?

Sorry for that title, but I used to live in several southern states in the United States, and people there often pronounce "get" like "git". (I hope they'll take this joke well, lol.)

The Git help command

If you need to see the Git help text, you can start by using the "git help" command, like this:

git help

This command displays the following output:

By Alvin Alexander on August 5, 2011

iOS version - How to determine your current iPhone OS version

iPhone version FAQ: How can I tell what version of the iPhone OS my iPhone is currently running?

Answer: You can see your iPhone OS version on your iPhone by going to Settings > General > About, and then Version will be one of the fields on that screen. When you get there, here's what this About screen looks like:

By Alvin Alexander on October 8, 2012

How to determine if your Java application is running on Mac OS X

If you're developing a Swing/Java application to run on multiple platforms, at some point you'll probably have to make some tweaks for each operating system. Yes, there are differences in Swing behavior between Mac OS X, Linux, and Windows, and you'll want to account for those.

By Alvin Alexander on October 20, 2012

Java FAQ: How to determine the Java version running your application

A frequently asked Java question is, "How can I tell what version of Java is running my program?"

Answer: Just use this line of source code to determine the version of Java that is running your program:

By Alvin Alexander on October 17, 2012

Java version - what version of Java am I using

Question: How can I tell what version of Java I'm using?

You can actually do different things on different platforms to figure out which version of Java you're using, and which versions of Java may be installed, but the one cross-platform (Unix, Linux, Mac OS X, Windows) thing you can do is open up a command-line window (a terminal on Unix and Mac, a Command windows on Windows) and type this command:

java -version

On my current Mac OS X version (10.4.10) the output from this command looks like this:

By Alvin Alexander on October 17, 2012

java.lang.UnsupportedClassVersionError (UnsupportedClassVersionError)

You know what will really screw with your mind? When there is a 1.4.2 version of a java.exe file in the C:\Windows\System32 directory of your Windows XP system, and you're trying to compile and run a Java 1.5 program from the command line. I kept getting this error message and couldn't figure it out, even though I knew what it meant(!):

By Alvin Alexander on October 17, 2012

Mac Java - how to use a different JVM on Mac OS/X 10.4

Mac Java FAQ: I'm currently using Mac OS/X 10.4 with Java 1.5.x. But, for a certain application I need to use a previous version of Java, which I can see is actually installed on the hard drive. Can I use this older Java JVM on Mac OS X 10.4?

Answer: Yes, I was able to do this. The hardest part about this is finding where the previous Java version is installed. There are probably easier ways to do it, but I ended up using the Mac mdfind command, which is the command-line version of Spotlight.

By Alvin Alexander on October 20, 2012

LaTeX versions - conditionally control your output

The "versions" package (versions.sty) can be very useful in conditionally controlling your output in LaTeX PDF and HTML documents.

LaTeX conditional output

Here's a very simple example of how you can use this package to conditionally control what is output by the LaTeX processor:

By Alvin Alexander on August 9, 2011
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