ruby on rails - Getting a "bad interpreter" error when using brew

Question

I'm getting this error when I try to run any brew command.

Holger-Sindbaeks-MacBook-Air:~ holgersindbaek$ brew help
-bash: /usr/local/bin/brew: /usr/bin/ruby: bad interpreter: No such file or directory

I have absolutely no idea on how to fix this and been searching for a long time without answer.

Answer 1

I got this error (much the same):

/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 26: /usr/local/Library/brew.rb: Undefined error: 0

and fixed by the solution below:

1. Open brew.rb:

   $ sudo vim /usr/local/Library/brew.rb
   

2. Change the first line's 1.8 to Current:

   Before:

   #!/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby -W0
   

   After:

   #!/System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby -W0
   

Then brew works for me. Hope it helps if any other one got this issue. :)

---

If you get the error

Homebrew requires Leopard or higher. For Tiger support, see: https://github.com/mistydemeo/tigerbrew

change the MACOS check from <10.5 to <10.

Tip by @TimCastelijns:

10.5 doesn't work because in comparison, it's higher than 10.10 (.1 vs .5). I added a check (and MACOS_VERSION != 10.10) instead of lowering from 10.5 to 10.