多个pig时，设置本用户的pig运行版本
cat ~/.bash_profile
# .bash_profile
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# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
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# User specific environment and startup programs
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PATH=/usr/bin/pig-0.9.2/bin:$PATH:$HOME/bin
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export PATH
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把首先要用的写在前面
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