OS X + Sed: “extra characters at the end of l command” Error


When executing the following command on OS X…

sed -i 's/megatron/pony/g' /path/to/file.txt

… the following error occurs:-

sed: 1: "/path/to/file.txt": extra characters at the end of l command


Unlike Ubuntu, OS X requires the extension to be explicitly specified. The workaround is to set an empty string:-

sed -i '' 's/megatron/pony/g' /path/to/file.txt

… and now, Megatron has transformed into a pony.

Mac OS X: Setting Default Java Version

Let’s assume we have installed JDK 7 or JDK 8, and we want to set the default Java version. There are several ways to set default Java version. This is by far the easiest way without the need to look for the installed path or mess around with symlinks.

First, let’s make sure we are not on crack and we indeed installed the version we want:-

➜  ~  /usr/libexec/java_home -verbose
Matching Java Virtual Machines (3):
    1.7.0_25, x86_64:	"Java SE 7"	/Library/Java/JavaVirtualMachines/jdk1.7.0_25.jdk/Contents/Home
    1.6.0_51-b11-457, x86_64:	"Java SE 6"	/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
    1.6.0_51-b11-457, i386:	"Java SE 6"	/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home

In this example, we are going to use JDK 1.7 as our default Java version. Open up the startup file (.bashrc, .zshrc, etc…) and enter this line:-

export JAVA_HOME="`/usr/libexec/java_home -v '1.7*'`"

Restart Terminal and verify the Java version:-

➜  ~  java -version
java version "1.7.0_25"
Java(TM) SE Runtime Environment (build 1.7.0_25-b15)
Java HotSpot(TM) 64-Bit Server VM (build 23.25-b01, mixed mode)
➜  ~  javac -version
javac 1.7.0_25

Homebrew: “Invalid Multibyte Escape” Error


When running brew on OS X Maverick, you get this error:-

Error: /usr/local/Library/Homebrew/download_strategy.rb:84: invalid multibyte escape: /^\037\213/
invalid multibyte escape: /^\037\235/
Please report this bug: https://github.com/mxcl/homebrew/wiki/Checklist-before-filing-a-new-issue
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'


After upgrading to OS X Mavericks, the default version of Ruby is v2.0, causing Homebrew to break because it relies on v1.8. See issue #23655 for more information.

To fix this, run the following command:-

brew update

If you are getting the “Permission Denied” errors when running the above command, run the following command to fix the permission problem:-

# Assuming your user name is USER_HERO
sudo chown -R USER_HERO:admin /usr/local
cd /usr/local
git reset --hard origin/master
brew update