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Read environment variables in Node.js
(8 answers)
Closed 9 years ago.
I see some NodeJS programs executed like this PARAM=1;node program.js
Im assuming its putting PARAM=1 into the environment. How do I access this in the node program? thanks,
Yes, PARAM=1 is setting an environment variable.
Depending on which shell you're using, you may need to use export PARAM=1 so the setting makes it to the child process. Otherwise the value would only exist for the shell.
As dystroy pointed out, the rest of your question is answered here.
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This question already has answers here:
What is the purpose of Node.js module.exports and how do you use it?
(13 answers)
Closed 1 year ago.
Regarding this question: What is the purpose of Node.js module.exports and how do you use it? I'm a Javascript beginner. In the referenced question...
Consider modules to be the same as JavaScript libraries.
A set of functions you want to include in your application.
https://www.w3schools.com/nodejs/nodejs_modules.asp
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Is it possible to produce stand alone haskell executable
(2 answers)
Do ghc-compiled binaries require GHC or are they self-contained?
(4 answers)
Closed 4 years ago.
I was trying to find out, whether the Haskell environment is needed to run Haskell program? For instance like Java.
Or does it work more like .net, where compiled .exe can be run on any computer wherever one copies it to?
I got this question, because in addition to normal arguments, one can give arguments for Haskell environment (+RTS -RTS) when launching an executable.
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Determine direct shared object dependencies of a Linux binary?
(4 answers)
Closed 5 years ago.
This probably already has an answer but I couldn't find it.
I want to know which shared object is used by the binary (based on LD_LIBRARY_PATH, /etc/ld.so.conf, etc...). Something similar to the which command but for .so.
Thanks
You should use the ldd utility. In the same environment you would load your executable (Same LD_LIBRARY_PATH, e.t.c.)
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When is the thread pool used?
(4 answers)
Closed 5 years ago.
I remember it seems that nodejs by default is using 4 back-end threads, therefore the fifth reading action will wait until 1 thread is available.
But I can't find any testify-example in google. Could someone explain and find the example please? Thanks.
It's in this post, as referred in the post from jfriend00. Thanks.
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Closed 8 years ago.
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I am new to LINUX. This question sounds simple and stupid, but I suppose this has a lot of meaning behind it. "HOW COMMANDS ARE PROCESSED IN LINUX?". Which means suppose if I give ls command,what makes it to display list of all files inside the directory?. I have been searching for the answer, and I could not find any clear explanation for the same. Please help me to solve the same.
I'm new too. But I can answer this in a top level.(not too many details).
Everything in Linux is file, which means that the ls is also a file. You can type which ls
and you can see the file's location.
So, a command is a file, when you type and Enter, the system will search for the file in your PATH and execute it. When the file is executed, it will talk with the kernel and tell the kernel what resources it wants to use, and then the kernel will talk with the real hardware and let the computer do the work.
Some commands are shell keywords or shell builtins, so the shell (the program that accepts your commands) recognizes and processes them directly. Many other commands are executable programs found in the path; so, for example, if you enter ls, an executable called ls is executed (usually found in /bin, many commands cann be found in /usr/bin/). A command could also be an alias for another command.
You can use type command to find out what kind a command is, e.g.
type ls.