CODEWITHSUNDEEP
node.jsshellvariables
user4513271
user4513271

Reputation:

Set a variable in shell from JavaScript (node.js)

I've got a script I run like this:

node script.js

From within script.js, I would like to pass a variable back out to the shell for continued use.

I'll say it again in case you didn't get it the first time: basically, running the JS to come up with a variable, then I want to use that variable for a shell command. I tried looking this up and I didn't have much luck figuring it out. Simply doing console.log(foo=bar) doesn't work.

Upvotes: 2

Views: 2268

Answers (1)

Petr Skocik
Petr Skocik

Reputation: 60097

The shell has to cooperate (well, usually -- you could force it to set the variable through gdb/ptrace, but that's very hacky and you could break the shell). You can output (console.log) the value and the shell can capture it:

variable=$(node script.js)

or you can output, e.g., evalable text that'll set the value and then eval it:

eval "$(node -e 'console.log("variable=42")')"
echo $variable

Upvotes: 2

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