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$ sudo -s
# echo 'export JAVA_HOME=/usr/local/java/jdk1.6.0_38' >> /etc/profile
# echo 'export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH' >> /etc/profile
# echo 'export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar' >> /etc/profile
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# source /etc/profile
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$ cd ~/
$ echo 'export JAVA_HOME=/usr/local/java/jdk1.6.0_38' >> ./.profile
$ echo 'export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH' >> ./.profile
$ echo 'export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar' >> ./.profile
$ source ./.profile
$ java -version
or
$ java
2.3 /etc/profile.d/java.sh
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$ sudo -s
# echo '# add java environments to all users' > /etc/profile.d/java.sh
# chmod 755 /etc/profile.d/java.sh
# echo 'export JAVA_HOME=/usr/local/java/jdk1.6.0_38' >> /etc/profile.d/java.sh
# echo 'export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH' >> /etc/profile.d/java.sh
# echo 'export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar' >> /etc/profile.d/java.sh
# shutdown -r now
转èªï¼
http://blog.csdn.net/cheungmine/article/details/8289335