windows 如何从文件内容设置环境变量？
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how to set environment variable from file contents?
提问by sramij
On windows/cygwin, i want to be able save the PATH variable to file on one machine and load it onto the other machine;
在 windows/cygwin 上，我希望能够将 PATH 变量保存到一台机器上的文件并将其加载到另一台机器上；
for storing the variable i am doing:
用于存储我正在做的变量：
echo %PATH% > dat
however, not sure how to load it later.
但是，不确定以后如何加载它。
set PATH=???????
Thanks Rami
谢谢拉米
回答by Aacini
Just use: set /P PATH=< dat
只需使用： set /P PATH=< dat
You must note that echo %PATH% > datinsert an additional space after %PATH% value; that space may cause problems if an additional path is later added to PATH variable. Just eliminate the extra space this way: echo %PATH%> dat.
您必须注意echo %PATH% > dat在 %PATH% 值后插入一个额外的空格；如果稍后将附加路径添加到 PATH 变量，则该空间可能会导致问题。只要消除了额外的空间是这样的：echo %PATH%> dat。
回答by dbenham
echo %PATH%will fail if the PATH contains an unquoted & or ^ (this is not likely, but certainly possible)
echo %PATH%如果 PATH 包含未加引号的 & 或 ^（这不太可能，但肯定可能），则会失败
A more reliable solution is to use:
更可靠的解决方案是使用：
setlocal enableDelayedExpansion
echo !path!>dat
Then you can use Aacini's suggested method of reading the value back in
然后您可以使用 Aacini 建议的方法读取值
set /p "PATH=" <dat
回答by ziesemer
Being dependent upon Cygwin, how how about putting the command in your saved file, e.g.:
依赖于 Cygwin，如何将命令放入您保存的文件中，例如：
echo "export PATH=$PATH" > dat
Then sourcing the script later to set the path:
然后稍后获取脚本以设置路径：
. ./dat
Note that "sourcing" the script (vs. just executing it) is required for it to modify your current environment - and not just new child environments.
请注意，它需要“采购”脚本（而不是仅执行它）来修改您当前的环境 - 而不仅仅是新的子环境。
回答by SpacedMonkey
This might be evil but on Windows I am using this:
这可能是邪恶的，但在 Windows 上我正在使用它：
for /F %%g in (dat) do set PATH=%%g
and this to write the file because I had trouble with spaces
这是为了写文件，因为我有空格问题
echo>dat %PATH%
