此下为几个重要的配置文件，在此记录下来便于以后参考：
1. ~/.bashrc
#for Gaussian09
export G09ROOT=/home/bean/g09
export GAUSS_EXEDIR=/home/bean/g09
export GAUSS_SCRDIR=$G09ROOT/scratch
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/$G09ROOT
export PATH=$PATH:/home/bean/g09
# for java
export JAVA_HOME=/home/bean/jdk1.7.0_09
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
# for hadoop
export HADOOP_INSTALL=/home/bean/hadoop-1.0.4
export PATH=$PATH:$HADOOP_INSTALL/bin
export JAVA_LIBRARY_PATH=$HADOOP_INSTALL/lib/native/linux-i386-32
# for eclipse
export ECLIPSE_HOME=/home/bean/eclipse