Xcode-select command not found

I tried to install homebrew on my Mac, but I could not tell with an error message that the xcode-select command was not found. I did some internet searches and realized there is one internet duplication. However, it doesn't give me a solution. Below is information about my environment and settings.

• I have xcode5.1.1 and xcode6beta6 installed on osx mavericks.
• I checked the PATH variable against "echo $ PATH" and the result is "/ usr / bin: / bin: / usr / sbin: / sbin: / usr / local / bin".
• I downloaded the command line tool from the Apple download page and installed it.
• Finally, I run the command "ruby -e" $ (curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install ) "to install the homebrew.

Results I got:

 "==> This script will install:
 /usr/local/bin/brew
 /usr/local/Library/...
 /usr/local/share/man/man1/brew.1

 Press RETURN to continue or any other key to abort
 ==> /usr/bin/sudo /bin/chmod g+rwx /Library/Caches/Homebrew
 Password:
 ==> Installing the Command Line Tools (expect a GUI popup):
 ==> /usr/bin/sudo /usr/bin/xcode-select --install
 sudo: /usr/bin/xcode-select: command not found
 Failed during: /usr/bin/sudo /usr/bin/xcode-select --install

      

        
        
        
      

    

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I've been trying to fix the problem all day. Someone please help. Many thanks.