特定のPATHを削除する

ここを参考に。
http://qiita.com/ironsand/items/10e28d7589298090ec23

~/.zshrcに以下を追加

path_append ()  { path_remove $1; export PATH="$PATH:$1"; }
path_prepend () { path_remove $1; export PATH="$1:$PATH"; }
path_remove ()  { export PATH=`echo -n $PATH | awk -v RS=: -v ORS=: '$0 != "'$1'"' | sed 's/:$//'`; }

$ source ~/.zshrc
$ path_remove PATH_TO_REMOVE