tools/upgrade.sh
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 current_path=`pwd`
 echo "Upgrading Oh My Zsh"
 ( cd $ZSH && git pull origin master )
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 echo "Hooray! Oh My Zsh has been updated and/or is at the current version. \nAny new updates will be reflected when you start your next terminal session."
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 echo "To keep up on the latest, be sure to follow Oh My Zsh on twitter: http://twitter.com/ohmyzsh"
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 cd $current_path