centos配置永久环境变量

cd /etc
vim profile
在下面添加自己要配置的变量，我自己的环境变量为例：

export JAVA_HOME=/usr/java/jdk1.8.0_131
export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar
export PATH=$"PATH:$JAVA_HOME/bin


export ARM_HOME=/usr/local/linaro-multilib-2014.06-gcc4.9
export PATH=$PATH:$ARM_HOME/bin

export ANDROID_NDK_HOME=/usr/android/android-ndk-r16
export PATH=$ANDROID_NDK_HOME:$PATH

export OPENSSL=/usr/local/openssl/bin
export PATH=$OPENSSL:$PATH:$HOME/bin