osx - Trouble Installing Homebrew on Mac -

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i having trouble installing homebrew on mac. running mac os x 10.8.4.

when try install through 

ruby -e "$(curl -fssl https://raw.github.com/mxcl/homebrew/go)"

or:

ruby <(curl -fsskl raw.github.com/mxcl/homebrew/go)

i get:

\-bash: curl: command not found -bash: ruby: command not found

i have tried:

cd /usr/local/bin  mkdir homebrew && curl -l https://github.com/mxcl/homebrew/tarball/master | tar xz --strip 1 -c homebrew

and got: 

-bash: mkdir: command not found

what think may wrong>


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