![]() ![]() ![]() Then the object returned by parseArgs() contains a property. We can get access to the tokens if we set config.tokens to true. Phase 2: It assembles the tokens into the object that is returned via the result property.However, if an option has a value then the token stores both option name and option value and therefore contains the data of two args elements. Phase 1: It parses args into an Array of tokens: These tokens are mostly the elements of args annotated with type information: Is it an option? Is it a positional? Etc. The two first items are Node.Put this at the bottom of the file: eval( process.argv 2 ) And call your function by doing: node index.js 'add( 1, 2 )' node index. ParseArgs() processes the args Array in two phases: With Node.js: Invoke the function from the command line: Note: this is only for development purposes. And it makes no difference if I use other variables with or without double quotes, or if I use a minus like this -pathxxx. ![]() This is how parseArgs() handles quoted values:Ĭonst options = ) 16.4 parseArgs tokens path'c:\data\test.txt' user'Name' pass'secret'. ![]() ', '%USERNAME%' ] 16.3.4.2 How parseArgs() handles quoted values > node args.mjs 'backtick`' '\t\n' '%USERNAME%' In Windows PowerShell, we can quote with single quotes, variable names are not interpolated inside quotes and single quotes can’t be escaped: > node args.mjs "say `"hi`"" "\t\n" "%USERNAME%" >node args.mjs -s "two words" -s 'two words' >node args.mjs -str='two words' -str="two words" Quoted option values in the Windows Command shell: >node args.mjs -str 'two words' -str "two words" >node args.mjs 'back slash\' '\t\n' '%USERNAME%' In the Windows Command shell single quotes are not special in any way: >node args.mjs "say \"hi\"" "\t\n" "%USERNAME%" args.mjs -str="two words" -str='two words' npm init -y This command will create a package.json file in your project folder. mkdir npm-script-demo cd npm-script-demo Next, initialize the node project by running the following command. parse with the process. In terms of input and output, the low-level Readline Node.js module could be used to prompt the user and request input, and in simple cases is more than adequate. args.mjs -str "two words" -str 'two words' Open up your terminal and create a project folder. In Nodejs, There are many ways we can read command line parameters from a terminal. The first element will be process.execPath. The following interaction demonstrates option values that are doube-quoted and single-quoted: %. The process.argv property returns an array containing the command-line arguments passed when the Node.js process was launched. Single quotes: all content is passed on verbatim and we can’t escape quotes: %. On Unix, these are the differences between double quotes and single quotes:ĭouble quotes: we can escape quotes with backslashes (which are otherwise passed on verbatim) and variables are interpolated: %. I will now post an example of the function. The process continues to run in the terminal. We are then forwarded through 'test/run', and render the 'index' view. In index, or '/', I have a function, which takes several parameters, and is initiated via clicking a button on the index page. To access the command-line arguments inside a app.js file, we need to use the process. Is this the way I should be doing this? Here is my Project Structure. I want to add in the option to run the server in a headless manner, using a command line argument. I have a web server, that initiates a command line process on a button press. I have a file structure, which I will enumerate for you in a moment. ![]()
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