Linux环境变量设置

Center os 用户环境变量修改

open  ~/.bash_profile       --进入用户环境变量设置

export JAVA_HOME=/usr/java/jdk1.7.0_76
export JAVA_BIN=$JAVA_HOME/bin
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

source ~/.bash_profile    --使配置文件起作用

printenv    --查看环境变量

MaC环境变量设置

Mac系统的环境变量，加载顺序为：

• /etc/profile
• /etc/paths
• ~/.bash_profile
• ~/.bash_login
• ~/.profile
• ~/.bashrc

当然/etc/profile和/etc/paths是系统级别的，系统启动就会加载，后面几个是当前用户级的环境变量。后面3个按照从前往后的顺序读取，如果~/.bash_profile文件存在，则后面的几个文件就会被忽略不读了，如果~/.bash_profile文件不存在，才会以此类推读取后面的文件。~/.bashrc没有上述规则，它是bash shell打开的时候载入的。

设置PATH的语法都为：

export PATH=$PATH:<PATH 1>:<PATH 2>:<PATH 3>:------:<PATH N>

两个方式设置环境变量

1.修改当前用户的环境变量，推荐方式是修改~/.bash_profile

export ANDROID_HOME=/Users/chenli4/Library/Android/sdk
export PATH=${PATH}:${ANDROID_HOME}/tools
export PATH=${PATH}:${ANDROID_HOME}/platform-tools
export PATH=${PATH}:/Users/chenli4/Library/Android/sdk/platform-tools
# Setting PATH for Python 3.7
# The original version is saved in .bash_profile.pysave
PATH="/Library/Frameworks/Python.framework/Versions/3.7/bin:${PATH}"
export PATH

 2.修改系统的环境变量，推荐方式是修改/etc/profile

# System-wide .profile for sh(1)

if [ -x /usr/libexec/path_helper ]; then
    eval `/usr/libexec/path_helper -s`
fi

if [ "${BASH-no}" != "no" ]; then
    [ -r /etc/bashrc ] && . /etc/bashrc
fi

JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk-10.0.2.jdk/Contents/Home"
export JAVA_HOME
CLASS_PATH="$JAVA_HOME/lib"
export ANDROID_HOME=/Users/chenli4/Library/Android/sdk
export PATH=${PATH}:${ANDROID_HOME}/tools
export PATH=${PATH}:${ANDROID_HOME}/platform-tools
export PATH=$JAVA_HOME/bin:$PATH

切换jdk10变成jdk8

打开Sublime Text，修改/etc/profile

JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_201.jdk/Contents/Home"

保存(需要输入密码)

  

来自：https://www.jianshu.com/p/f1adedbda0d3

         https://yq.aliyun.com/articles/580913