Set gem sources to "taobao" or reset to "rubygems.org"

SetGemSources.sh

#!/bin/bash

param=$1
oldsource=`gem sources | tail -n 1`
if [ "$param"x = "setx" ]; then
  newsource="https://ruby.taobao.org/"
else
  newsource="https://rubygems.org/"
fi

#echo "oldsource: $oldsource"
#echo "newsource: $newsource"

case "$param" in 
  set|reset)
    gem sources --remove $oldsource
    gem sources -a $newsource
    echo "gem source updated:"
    gem source -l
    ;;
  *)
    echo "Usage: $0 {set|reset}"
    exit 1
    ;;
esac