osx-yosemite

After installing Yosemite, I was unable to run brew or ruby. I was getting this error on brew update: /usr/local/bin/brew: /usr/local/Library/brew.rb: /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby: bad interpreter: No such file or directory /usr/local/bin/brew: line 23: /usr/local/Library/brew.rb: Undefined error: 0 getting this error on irb: /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/fileutils.rb:245:in mkdir': Permission denied - /Library/Ruby/Gems/2.0.0/extensions/universal-darwin-14 (Errno::EACCES) from /System/Library/Frameworks/Ruby

package main import ( "io" "net/http" ) func hello(w http.ResponseWriter, r *http.Request) { io.WriteString(w, "Hello world!\n") } func main() { http.HandleFunc("/", hello) http.ListenAndServe(":8000", nil) } I've got a couple of incredibly basic HTTP servers, and all of them are exhibiting this problem. $ ab -c 1000 -n 10000 http://127.0.0.1:8000/ This is ApacheBench, Version 2.3 <$Revision: 1604373 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/ Benchmarking 127.0.0.1 (be patient) Completed 1000

I am trying to edit an entry to PATH, as I did something wrong. I am using Mac OS X 10.10.3 I have tried: > touch ~/.bash_profile; open ~/.bash_profile But the file editor opens with nothing inside. My problem: I am trying to install ANDROID_HOME to my PATH I misspelled it, but when I closed the terminal and went back it was gone, so I tried again: export ANDROID_HOME=/<installation location>/android-sdk-macosx export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools This time, I typed the command correctly but, when I closed the terminal, my settings disappeared again. How do I