ヾ(oﾟωﾟo)ﾉﾞzshが「command not found」と云う ref: http://qiita.com/harapeko_wktk/items/285d5c2a409346e3d55e

file0.txt

% brew -v
zsh: command not found: brew
% rbenv -v
zsh: command not found: rbenv
% coffee -v
zsh: command not found: coffee

file1.txt

% echo $PATH
/usr/local/heroku/bin /usr/bin /bin

file2.txt

% PATH=/bin:/usr/bin:/usr/local/bin:${PATH}
% export PATH

file3.txt

% echo $PATH
/usr/local/heroku/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/git/bin:

file4.txt

% brew -v
Homebrew 0.9.5
% rbenv -v
rbenv 0.4.0
% coffee -v
CoffeeScript version 1.6.3