cmd设置环境变量

• 方法，仅本次生效 set path=%path%;【新路径】
• 方法，永久生效 setx path "%path%;【新路径】"
• 方法，永久生效 wmic ENVIRONMENT create name="【变量名】",username="<system>",VariableValue="【变量值】"

附一个系统代理切换脚本

@echo off

if "%1" == "yes" set judge=true & goto yes
if "%1" == "no" set judge=true & goto no
if "%judge%" NEQ "true" goto auto

exit /b

:no
  echo no proxy
  set http_proxy=
  set https_proxy=
  wmic ENVIRONMENT where "name='http_proxy'" delete
  wmic ENVIRONMENT where "name='https_proxy'" delete
exit /b

:yes
  echo yes proxy
  set http_proxy=http://127.0.0.1:1080
  set https_proxy=http://127.0.0.1:1080
  wmic ENVIRONMENT create name="http_proxy",username=%username%,VariableValue="http://127.0.0.1:1080"
  wmic ENVIRONMENT create name="https_proxy",username=%username%,VariableValue="http://127.0.0.1:1080"
exit /b

:auto
  wmic ENVIRONMENT where "name='http_proxy'"|findstr http_proxy
  if %errorlevel%==0 (
    goto :no
  ) else (
    goto :yes
  )
exit /b

使用方式:

# 自动切换
proxy

# 使用代理
proxy yes

# 不使用代理
proxy no

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