多个pig时，设立本用户的pig运行版本

cat ~/.bash_profile

# .bash_profile

# Get the aliases and functions

if [ -f ~/.bashrc ]; then

. ~/.bashrc

fi

# User specific environment and startup programs

PATH=/usr/bin/pig-0.9.2/bin:$PATH:$HOME/bin

export PATH

把首先要用的写在前面