Linux下配置环境变量的脚本

放置在 /etc/profile.d/env.sh

#Normal-ENV
export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8
export TZ='Asia/Shanghai'
export APP_HOME=/data

#Path-ENV
ENV_PATH=()
ENV_PATH[${#ENV_PATH[@]}]=APP_PATH:/data/app/bin 

for item in ${ENV_PATH[@]};
do
  path_name=${item#*:}
  path_value=${item##*:}

  found=0
  pathlist=(${PATH//:/ })
  for pathitem in ${pathlist[@]}
  do
     if [ "$pathitem" == "$path_value" ];then
       found=1
       break
     fi
  done
  if [ $found -ne 1 ];then
    PATH=$PATH:$path_value
  fi
done
export PATH

放置在 /bin/set-path

#!/bin/bash
KEY=$1
VALUE=$2

if [ -z $KEY ]; then
  echo "key not found!"
  exit 1
fi

if [ -z $VALUE ]; then
  echo "value not found!"
  exit 1
fi

#查看环境变量是否已存在
COUNT=`sed -n '/'$KEY'_PATH:/p' /etc/profile.d/env.sh | wc -l`
#对VALUE中的"/"增加转义符为"\\/"
VALUE=`echo "$VALUE" | sed -s "s/\//\\\\\\\\\//g"`

if [ $COUNT -ge 1 ];then
  #如果存在，则修改
  sed -i "s/"$KEY"_PATH:.*$/"$KEY"_PATH:"$VALUE"/g" /etc/profile.d/env.sh
else
  #如果不存在，则添加
  sed -i "/ENV_PATH=()/a\ENV_PATH[\${\#ENV_PATH[\@]}]="$KEY"_PATH:"$VALUE /etc/profile.d/env.sh
fi
#使其生效
source /etc/profile

为该文件添加执行权限：chmod +x ./set-path
示例运行：

$ set-path scala /usr/local/scala/bin     // 将scala/bin 添加到环境变量 
$ source /etc/profile