多个pig时，设置本用户的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