linux增加用户环境变量

linux和windows环境变量，有相通之处

• 环境变量都是PATH
• 都有系统环境变量和用户环境变量之分
• 通常只需要修改用户环境变量即可

linux环境变量路径：

• 系统环境变量：etc/profile
• 用户环境变量：~/.bashrc

• 查看当前环境变量，路径由：隔开

eric@eric-PC:~$ echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/sbin:/usr/sbin:/usr/local/include/ImageMagick-7/:/usr/include/gtk-2.0/gtk/:/usr/local/mipsel-openwrt-linux-musl-gcc/bin

• 新增用户环境变量，~/.bashrc后面追加

# arm linux gcc
export ARM_GCC_PATH=/usr/local/arm/arm-linux-gcc
export PATH=$PATH:$ARM_GCC_PATH/bin

• source ~/.bashrc 使修改生效

eric@eric-PC:/$ source ~/.bashrc 
eric@eric-PC:/$ echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/sbin:/usr/sbin:/usr/local/include/ImageMagick-7/:/usr/include/gtk-2.0/gtk/:/usr/local/mipsel-openwrt-linux-musl-gcc/bin:/usr/local/arm/arm-linux-gcc/bin

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