ubuntu下临时环境变量的设置和取消

source   ./env_set.sh

#!/bin/bash

export ISVP_ENV_TOOLCHAIN_DIR=/opt/mips-linux-gnu-ingenic-gcc7.2.0-glibc2.29-fp64/bin

export PATH=${ISVP_ENV_TOOLCHAIN_DIR}:$PATH
 

source  ./env_unset.sh

#!/bin/bash

export PATH=${PATH//"${ISVP_ENV_TOOLCHAIN_DIR}:"/}

unset ISVP_ENV_TOOLCHAIN_DIR