Setting and reading Windows ENV variable in node?

Question

In my package.json I have this entry :

"runMe": "set  AAA=3 && echo %AAA%"

which looks like that :

In general, I want to set env variable, and to read it at the next section...

I'm expecting to get in console: 3

But instead I get this %AAA% :

Question:

How can I get the echo to show 3? I prefer ( please) not to use third-party libraries.

Io-oI · Accepted Answer · 2019-12-22 18:02:39Z

1

For same section, try:

"runMe": "set  \"AAA=3\" && cmd /v/c echo %AAA%"
"runMe": "(set  \"AAA=3\") && cmd /v/c echo %AAA%"

rem :: or :: 

"runMe": "set  \"AAA=3\" && cmd /v/c echo !AAA!"
"runMe": "(set  \"AAA=3\") && cmd /v/c echo !AAA!"

for to read it at the next and same section, you need use global variable

"runMe": "setx  AAA 3 && for /f tokens^=3 %i in ('reg query HKCU\Environment ^|find aaa')do echo=%i"

For cmd command line, remove the scaping in \":

set  "AAA=3" && cmd /v/c echo %AAA%
(set  "AAA=3") && cmd /v/c echo %AAA%

rem :: or :: 

set  "AAA=3" && cmd /v/c echo !AAA!
(set  "AAA=3") && cmd /v/c echo !AAA!

_{Sorry my limited English}

edited Dec 22, 2019 at 18:02

answered Dec 22, 2019 at 17:43

Io-oI

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4 Comments

Royi Namir Over a year ago

btw ive managet to do it with SETLOCAL EnableDelayedExpansion in a batch file with !var! which causes it to be late binded

Io-oI Over a year ago

Direct in cmd : the SETLOCAL EnableDelayedExpansion == cmd /v --> cmd /v/c echo !AAA!"

Royi Namir Over a year ago

btw - not it works in node but not in cmd. I mean why does this set \"AAA=3\" && cmd /v/c echo %AAA% doesnt work straight in cmd ?

Io-oI Over a year ago

\" scape coma for send the command to cmd.exe subsystem, this one in cmd: set "AAA=3" && cmd /v/c echo %AAA%

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